diff --git a/frontend/index.html b/frontend/index.html
index 8158918..94df0b6 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1903,7 +1903,7 @@
 // ===== Version =====
 // Single source of truth for the PWA version: shown in the header and used
 // by the server version check in pysimConnect().
-const SIMPLE_VERSION = '3.22.5';
+const SIMPLE_VERSION = '3.22.6';
 document.getElementById('app-version').textContent = 'v' + SIMPLE_VERSION;
 
 // ===== view history (the browser Back/Forward buttons) =====
@@ -1917,7 +1917,9 @@ let _scp80Sub = 'sp';
 let _capduSub = 'sim';
 let _phoneSub = 'phone';
 let _scp81Sub = 'listener';
+let _pysimSub = 'files';
 let _cardsView = 'list';
+let _cardsEditId = null;       // the preset being edited (id; null = a new one)
 let _navState = null;          // the state of the current history entry
 let _navApplying = false;      // replaying: the switch functions must not record
 let _navOk = true;             // false when pushState is unavailable (file://)
@@ -1948,10 +1950,10 @@ function navCurrent() {
 			if (_testView === 'script' && _testScriptId) st.script = _testScriptId;
 		}
 	} else if (_activeTab === 'scp81') st.sub = _scp81Sub;
+	else if (_activeTab === 'pysim') st.sub = _pysimSub;
 	else if (_activeTab === 'cards') {
 		st.view = _cardsView;
-		const p = (_cardsEditIdx !== null && cards[_cardsEditIdx]) ? cards[_cardsEditIdx] : null;
-		if (_cardsView === 'edit' && p) st.preset = p.id || '';
+		if (_cardsView === 'edit' && _cardsEditId) st.preset = _cardsEditId;
 	} else if (_activeTab === 'profiler') {
 		st.view = profilerView;
 		if (profilerView === 'list') st.listtab = profilerListTab;
@@ -2007,11 +2009,18 @@ function navApply(st) {
 			if ((st.sub || 'phone') === 'test') navApplyTest(st);
 		} else if (st.tab === 'scp81') {
 			scp81SwitchSubtab(st.sub || 'listener');
+		} else if (st.tab === 'pysim') {
+			pysimSwitchSubtab(st.sub || 'files');
 		} else if (st.tab === 'cards') {
 			navApplyCards(st);
 		} else if (st.tab === 'profiler') {
 			navApplyProfiler(st);
 		}
+	} catch (e) {
+		// a replay must never leave the app half-switched: fall back to the
+		// default tab (the console carries the original failure)
+		if (typeof console !== 'undefined') console.warn('navApply failed:', e);
+		try { switchTab('c-apdu'); } catch (e2) { /* the default view failed too */ }
 	} finally {
 		_navApplying = false;
 	}
@@ -2128,6 +2137,9 @@ function cApduSwitchSubtab(name) {
 	// Nested names select the Parser pill first, so callers can keep
 	// addressing the panels directly (e.g. after a successful send).
 	if (name === 'parse' || name === 'response') {
+		// Set the target sub first: the recursion's own parserSwitchSubtab
+		// then renders it, so the two records collapse into one entry.
+		_parserSub = name;
 		cApduSwitchSubtab('parser');
 		parserSwitchSubtab(name);
 		return;
@@ -13595,6 +13607,7 @@ function cardsSetFormMode() {
 // "Add preset" in the list view: reset the form and open the editor.
 function cardsNew() {
 	_cardsEditIdx = null;
+	_cardsEditId = null;
 	cardsClearForm();
 	cardsSetFormMode();
 	cardsShowEditor();
@@ -13697,6 +13710,7 @@ function cardsEdit(i) {
 	const c = cards[i];
 	if (!c) return;
 	_cardsEditIdx = i;
+	_cardsEditId = c.id || null;
 	const set = (id, value) => {
 		const el = document.getElementById('cards-' + id);
 		if (el) el.value = value == null ? '' : value;
@@ -13718,6 +13732,7 @@ function cardsEdit(i) {
 function cardsCancelEdit() {
 	navReplace();
 	_cardsEditIdx = null;
+	_cardsEditId = null;
 	cardsSetFormMode();
 	cardsClearForm();
 	cardsShowList();
@@ -13741,6 +13756,7 @@ async function cardsRemove(i) {
 	_ramCardIdx = ramCardIdxAfterRemove(_ramCardIdx, i);
 	if (_cardsEditIdx === i) _cardsEditIdx = null;
 	else if (_cardsEditIdx !== null && _cardsEditIdx > i) _cardsEditIdx--;
+	if (_cardsEditId === c.id) _cardsEditId = null;
 	await cardsFetch();
 }
 
@@ -14193,6 +14209,7 @@ let pysimCmdHistIdx = -1;
 let _pysimAutoConnectAttempted = false;
 
 function pysimSwitchSubtab(name) {
+	_pysimSub = name;
 	document.querySelectorAll('.pysim-subtab').forEach(btn => {
 		const isActive = btn.dataset.pysimSub === name;
 		btn.classList.toggle('bg-blue-600', isActive);
@@ -14208,6 +14225,7 @@ function pysimSwitchSubtab(name) {
 	pysimHelpAnchor = {cmd:'pysim-cmdline', apdu:'raw-apdu', files:'file-manager'}[name] || 'card-reader';
 	setHelpAnchor(pysimHelpAnchor);
 	if (name === 'files') pysimFsFitTree();
+	navRecord();
 }
 
 function pysimCmdKeydown(e) {
diff --git a/frontend/sw.js b/frontend/sw.js
index d320d8a..49d20f5 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simple-v409';
+const CACHE = 'simple-v410';
 const URLS = [
   'index.html',
   'help.html',
diff --git a/frontend/tests/nav.test.js b/frontend/tests/nav.test.js
index d98b6b7..8bf5011 100644
--- a/frontend/tests/nav.test.js
+++ b/frontend/tests/nav.test.js
@@ -44,12 +44,42 @@ test('navStateKey canonicalises the view state', () => {
 	}
 });
 
+test('navCurrent builds the state from the view variables', () => {
+	// the module view variables + the one helper it calls, stubbed
+	eval(`var _activeTab = 'c-apdu', _scp80Sub = 'sp', _capduSub = 'sim', _parserSub = 'parse',
+		_phoneSub = 'phone', _scp81Sub = 'listener', _pysimSub = 'files', _cardsView = 'list',
+		_cardsEditId = null, _testView = 'suites', _testScriptId = null, _navSuite = null,
+		profilerView = 'list', profilerListTab = 'profiles', profilerEditId = null,
+		snapshotViewId = null;
+		function testCurrentSuite() { return _navSuite; }`);
+	eval(extractFunc(html, 'navCurrent'));
+	_activeTab = 'scp80'; _scp80Sub = 'ram';
+	assert.deepStrictEqual(navCurrent(), { tab: 'scp80', sub: 'ram' });
+	_activeTab = 'c-apdu'; _capduSub = 'parser'; _parserSub = 'response';
+	assert.deepStrictEqual(navCurrent(), { tab: 'c-apdu', sub: 'parser', parser: 'response' });
+	_activeTab = 'phone'; _phoneSub = 'test'; _testView = 'script';
+	_navSuite = { id: 'S' }; _testScriptId = 'C';
+	assert.deepStrictEqual(navCurrent(),
+		{ tab: 'phone', sub: 'test', view: 'script', suite: 'S', script: 'C' });
+	_activeTab = 'pysim'; _pysimSub = 'apdu';
+	assert.deepStrictEqual(navCurrent(), { tab: 'pysim', sub: 'apdu' });
+	_activeTab = 'cards'; _cardsView = 'edit'; _cardsEditId = 'P';
+	assert.deepStrictEqual(navCurrent(), { tab: 'cards', view: 'edit', preset: 'P' });
+	// a new-preset editor carries no id
+	_cardsEditId = null;
+	assert.deepStrictEqual(navCurrent(), { tab: 'cards', view: 'edit' });
+	_activeTab = 'profiler'; profilerView = 'snapshot'; snapshotViewId = 'N';
+	assert.deepStrictEqual(navCurrent(), { tab: 'profiler', view: 'snapshot', item: 'N' });
+	profilerView = 'list'; profilerListTab = 'custom';
+	assert.deepStrictEqual(navCurrent(), { tab: 'profiler', view: 'list', listtab: 'custom' });
+});
+
 test('the view switches record history, the back buttons replace it', () => {
 	// every user-facing switch records its view
 	for (const fn of ['switchTab', 'scp80SwitchSubtab', 'cApduSwitchSubtab',
 		'parserSwitchSubtab', 'phoneSwitchSubtab', 'scp81SwitchSubtab',
-		'cardsShowList', 'cardsShowEditor', 'testViewShow', 'profilerSetView',
-		'profilerListSwitch']) {
+		'pysimSwitchSubtab', 'cardsShowList', 'cardsShowEditor', 'testViewShow',
+		'profilerSetView', 'profilerListSwitch']) {
 		assert.match(extractFunc(html, fn), /navRecord\(\)/, fn + ' must record');
 	}
 	// the view variables the state is built from
@@ -58,8 +88,15 @@ test('the view switches record history, the back buttons replace it', () => {
 	assert.match(extractFunc(html, 'cApduSwitchSubtab'), /_capduSub = name/);
 	assert.match(extractFunc(html, 'phoneSwitchSubtab'), /_phoneSub = name/);
 	assert.match(extractFunc(html, 'scp81SwitchSubtab'), /_scp81Sub = name/);
+	assert.match(extractFunc(html, 'pysimSwitchSubtab'), /_pysimSub = name/);
 	assert.match(extractFunc(html, 'cardsShowList'), /_cardsView = 'list'/);
 	assert.match(extractFunc(html, 'cardsShowEditor'), /_cardsView = 'edit'/);
+	assert.match(extractFunc(html, 'cardsEdit'), /_cardsEditId = c\.id/);
+	assert.match(extractFunc(html, 'cardsNew'), /_cardsEditId = null/);
+	// the nested parser switch must not record two entries (the target sub is
+	// set before the recursion)
+	const capdu = extractFunc(html, 'cApduSwitchSubtab');
+	assert.match(capdu, /_parserSub = name;\s*cApduSwitchSubtab\('parser'\)/);
 	// the in-app Cancel/Back (and the profiler save) replace their entry
 	for (const fn of ['cardsCancelEdit', 'profilerBackToList', 'testScriptBack',
 		'profilerSaveProfile']) {
@@ -70,8 +107,15 @@ test('the view switches record history, the back buttons replace it', () => {
 	assert.match(html, /history\.pushState\(/);
 	assert.match(html, /history\.replaceState\(/);
 	assert.match(html, /navSeed\(\);/);
-	assert.match(extractFunc(html, 'navApply'), /_navApplying = true/);
-	assert.match(extractFunc(html, 'navApply'), /switchTab\(/);
+	const apply = extractFunc(html, 'navApply');
+	assert.match(apply, /_navApplying = true/);
+	assert.match(apply, /switchTab\(/);
+	assert.match(apply, /pysimSwitchSubtab\(/);
+	assert.match(apply, /navApplyTest\(/);
+	assert.match(apply, /navApplyCards\(/);
+	assert.match(apply, /navApplyProfiler\(/);
+	// a throwing replay falls back instead of escaping the popstate handler
+	assert.match(apply, /catch \(e\)/);
 	for (const fn of ['navApplyTest', 'navApplyCards', 'navApplyProfiler', 'testBackToSuites']) {
 		assert.match(html, new RegExp('function ' + fn + '\\('), fn + ' must exist');
 	}
diff --git a/pyproject.toml b/pyproject.toml
index a25f6df..a20d909 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.22.5"
+version = "3.22.6"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.
diff --git a/pysim_simple_server/server.py b/pysim_simple_server/server.py
index fb1c0fd..dd43f2d 100644
--- a/pysim_simple_server/server.py
+++ b/pysim_simple_server/server.py
@@ -36,7 +36,7 @@ from osmocom.tlv import BER_TLV_IE
 from osmocom.utils import rpad
 
 
-VERSION = '3.22.5'
+VERSION = '3.22.6'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE