Go to the sample2 html file in viewer and you get the following asserts: User break at 05FA9C30 dprintf(const char*, ...)+00058 Warning: "no region associated with aFrame" at file nsSpaceManager.cpp, line 799 User break at 05FA9C30 dprintf(const char*, ...)+00058 Warning: "no region associated with aFrame" at file nsSpaceManager.cpp, line 799 Then as soon as the page acutally renders and you move the mouse, you get: PowerPC access exception at 05B78018 nsMacEventHandler::HandleMouseMoveEvent(EventRecord&)+00 0C8 Calling chain using A6/R1 links Back chain ISA Caller 00000000 PPC 033E3788 03DC8980 PPC 033C864C main+00088 03DC8930 PPC 033C7C74 nsNativeViewerApp::Run()+00034 03DC88F0 PPC 05B7F748 nsAppShell::Run()+00108 03DC8810 PPC 05B7FFC4 nsMacMessagePump::DoMessagePump()+001A4 03DC87A0 PPC 05B80980 nsMacMessagePump::DoIdle(EventRecord&)+00038 03DC8760 PPC 05B8062C nsMacMessagePump::DoMouseMove(EventRecord&)+00050 03DC8710 PPC 05B80A20 nsMacMessagePump::DispatchOSEventToRaptor(EventRecord&, GrafPort *)+0004C 03DC86C0 PPC 05B7ABC4 nsMacMessageSink::DispatchOSEvent(EventRecord&, GrafPort*)+00048 03DC8680 PPC 05B7692C nsMacWindow::HandleOSEvent(EventRecord&)+0004C 03DC8620 PPC 05B76CAC nsMacEventHandler::HandleOSEvent(EventRecord&)+000F4 NMI

Mike, does this really look like a layout bug to you?

I thought that the asserts about regions not being associated with frames might be the key. Would a better component be gfx, widget, or HTMLFrames?

*** This bug has been marked as a duplicate of 3147 ***

Verified duplicate.