CVS build from about sunday, i have live switching enabled and i switched from modern to classic before opening composer (glazou asked me to). This build has a normal profile provider instead of my favorite null provider (dmose wanted me to test something). Error reading file jar:resource:///chrome/comm.jar!/content/editor/menus.xul Parse Time (this=05458880): Real time 0:0:0.231, CP time 0.230 DTD Time: Real time 0:0:0.0, CP time 0.000 Tokenize Time: Real time 0:0:0.91, CP time 0.090 Reflow time (this=045C06F0): Real time 0:0:0.201, CP time 0.130 Frame construction plus style resolution time (this=045C06F0): Real time 0:0:1.41, CP time 1.021 Style resolution time (this=045C06F0): Real time 0:0:4.96, CP time 3.645 Parse Time (this=0475C358): Real time 0:0:2.93, CP time 1.963 DTD Time: Real time 0:0:0.0, CP time 0.000 Tokenize Time: Real time 0:0:0.0, CP time 0.000 *** Failed to load overlay chrome://editor/content/menus.xul ###!!! ASSERTION: initial containing block already created: 'nsnull == mInitialContainingBlock', file i:/build/mozilla/layout/html/style/src/nsCSSFrameConstructor.cpp, line 8992 ###!!! ASSERTION: Popup set is already defined! Only 1 allowed.: 'Not Reached', file i:/build/mozilla/layout/xul/base/src/nsRootBoxFrame.cpp, line 303 Break: at file i:/build/mozilla/layout/xul/base/src/nsRootBoxFrame.cpp, line 303 NTDLL! 77f9f9df() nsDebug::Assertion(const char * 0x02adbf24, const char * 0x1013373c, const char * 0x02adbeec, int 303) line 280 + 13 bytes nsDebug::NotReached(const char * 0x02adbf24, const char * 0x02adbeec, int 303) line 457 + 22 bytes nsRootBoxFrame::SetPopupSetFrame(nsRootBoxFrame * const 0x0413d314, nsIFrame * 0x055771ec) line 303 + 21 bytes nsPopupSetFrame::Init(nsPopupSetFrame * const 0x055771ec, nsIPresContext * 0x045bf420, nsIContent * 0x03092228, nsIFrame * 0x05577160, nsIStyleContext * 0x0413d4dc, nsIFrame * 0x00000000) line 172 nsCSSFrameConstructor::InitAndRestoreFrame(nsIPresContext * 0x045bf420, nsFrameConstructorState & {...}, nsIContent * 0x03092228, nsIFrame * 0x05577160, nsIStyleContext * 0x0413d4dc, nsIFrame * 0x00000000, nsIFrame * 0x055771ec) line 6816 + 32 bytes nsCSSFrameConstructor::ConstructXULFrame(nsIPresShell * 0x045c06f0, nsIPresContext * 0x045bf420, nsFrameConstructorState & {...}, nsIContent * 0x03092228, nsIFrame * 0x05577160, nsIAtom * 0x01526158, int 8, nsIStyleContext * 0x0413d4dc, nsFrameItems & {...}, int 0, int & 0) line 5862 nsCSSFrameConstructor::ConstructFrameInternal(nsIPresShell * 0x045c06f0, nsIPresContext * 0x045bf420, nsFrameConstructorState & {...}, nsIContent * 0x03092228, nsIFrame * 0x05577160, nsIAtom * 0x01526158, int 8, nsIStyleContext * 0x0413d4dc, nsFrameItems & {...}, int 0) line 7435 + 57 bytes nsCSSFrameConstructor::ConstructFrame(nsIPresShell * 0x045c06f0, nsIPresContext * 0x045bf420, nsFrameConstructorState & {...}, nsIContent * 0x03092228, nsIFrame * 0x05577160, nsFrameItems & {...}) line 7319 + 56 bytes nsCSSFrameConstructor::CreateAnonymousFrames(nsIPresShell * 0x045c06f0, nsIPresContext * 0x045bf420, nsFrameConstructorState & {...}, nsIContent * 0x04614850, nsIDocument * 0x045bc748, nsIFrame * 0x05577160, nsFrameItems & {...}) line 5302 nsCSSFrameConstructor::CreateAnonymousFrames(nsIPresShell * 0x045c06f0, nsIPresContext * 0x045bf420, nsIAtom * 0x00000000, nsFrameConstructorState & {...}, nsIContent * 0x04614850, nsIFrame * 0x05577160, nsFrameItems & {...}, int 1) line 5239 nsCSSFrameConstructor::ConstructDocElementFrame(nsIPresShell * 0x045c06f0, nsIPresContext * 0x045bf420, nsFrameConstructorState & {...}, nsIContent * 0x04614850, nsIFrame * 0x0413d28c, nsIStyleContext * 0x0413d34c, nsIFrame * & 0x05577160) line 3541 nsCSSFrameConstructor::ContentInserted(nsCSSFrameConstructor * const 0x045c05c8, nsIPresContext * 0x045bf420, nsIContent * 0x00000000, nsIContent * 0x04614850, int 0, nsILayoutHistoryState * 0x00000000, int 0) line 9017 StyleSetImpl::ContentInserted(StyleSetImpl * const 0x045c02b0, nsIPresContext * 0x045bf420, nsIContent * 0x00000000, nsIContent * 0x04614850, int 0) line 1530 PresShell::InitialReflow(PresShell * const 0x045c06f0, int 1560, int 0) line 2796 nsXULDocument::StartLayout() line 4642 nsXULDocument::ResumeWalk() line 5795 nsXULDocument::ParserObserver::OnStopRequest(nsXULDocument::ParserObserver * const 0x0475a9d8, nsIRequest * 0x0475dbc8, nsISupports * 0x00000000, unsigned int 2147500037) line 7125 + 11 bytes nsParser::OnStopRequest(nsParser * const 0x0475c35c, nsIRequest * 0x0475dbc8, nsISupports * 0x00000000, unsigned int 2147500037) line 2452 nsJARChannel::OnStopRequest(nsJARChannel * const 0x0475dbcc, nsIRequest * 0x0475dd0c, nsISupports * 0x00000000, unsigned int 2147500037) line 606 + 49 bytes nsOnStopRequestEvent::HandleEvent() line 213 nsARequestObserverEvent::HandlePLEvent(PLEvent * 0x046754cc) line 116 PL_HandleEvent(PLEvent * 0x046754cc) line 644 + 10 bytes PL_ProcessPendingEvents(PLEventQueue * 0x00fc71a8) line 574 + 9 bytes _md_EventReceiverProc(HWND__ * 0x001100f4, unsigned int 49306, unsigned int 0, long 16544168) line 1335 + 9 bytes USER32! 77e13eb0() USER32! 77e1401a() USER32! 77e13f0f() nsAppShellService::Run(nsAppShellService * const 0x01532968) line 472 main1(int 1, char * * 0x002847a0, nsISupports * 0x00276eb8) line 1541 + 32 bytes main(int 1, char * * 0x002847a0) line 1902 + 37 bytes mainCRTStartup() line 338 + 17 bytes KERNEL32! 77e87903() If you want more details please indicate what fields would be useful.