Found this information in talkback database. It was one of only three talkback reports (and two unique signatures) with "MathML" in the stack signature. Stack Signature nsMathMLmphantomFrame::Paint 29733111 Trigger Time 2002-03-18 10:00:28 Email Address URL visited Build ID 2002031106 Product ID MozillaBranch Platform Operating System Win32 Module Trigger Reason In page error User Comments Stack Trace nsMathMLmphantomFrame::Paint [d:\builds\seamonkey\mozilla\layout\mathml\base\src\nsMathMLmphantomFrame.cpp, line 87] nsTransactionManager::DidMergeNotify [d:\builds\seamonkey\mozilla\editor\txmgr\src\nsTransactionManager.cpp, line 1042] nsTransactionManager::EndTransaction [d:\builds\seamonkey\mozilla\editor\txmgr\src\nsTransactionManager.cpp, line 1187] nsTransactionManager::DoTransaction [d:\builds\seamonkey\mozilla\editor\txmgr\src\nsTransactionManager.cpp, line 147] nsEditor::Do [d:\builds\seamonkey\mozilla\editor\libeditor\base\nsEditor.cpp, line 494] nsEditor::DeleteSelectionImpl [d:\builds\seamonkey\mozilla\editor\libeditor\base\nsEditor.cpp, line 4322] nsPlaintextEditor::DeleteSelection [d:\builds\seamonkey\mozilla\editor\libeditor\text\nsPlaintextEditor.cpp, line 943] nsTextEditRules::WillInsertText [d:\builds\seamonkey\mozilla\editor\libeditor\text\nsTextEditRules.cpp, line 513] nsTextEditRules::WillDoAction [d:\builds\seamonkey\mozilla\editor\libeditor\text\nsTextEditRules.cpp, line 283] nsPlaintextEditor::InsertText [d:\builds\seamonkey\mozilla\editor\libeditor\text\nsPlaintextEditor.cpp, line 982] nsPlaintextEditor::TypedText [d:\builds\seamonkey\mozilla\editor\libeditor\text\nsPlaintextEditor.cpp, line 558] nsPlaintextEditor::HandleKeyPress [d:\builds\seamonkey\mozilla\editor\libeditor\text\nsPlaintextEditor.cpp, line 516] nsTextEditorKeyListener::KeyPress [d:\builds\seamonkey\mozilla\editor\libeditor\text\nsEditorEventListeners.cpp, line 293] nsEventListenerManager::HandleEvent [d:\builds\seamonkey\mozilla\content\events\src\nsEventListenerManager.cpp, line 1654] nsGenericElement::HandleDOMEvent [d:\builds\seamonkey\mozilla\content\base\src\nsGenericElement.cpp, line 1650] nsHTMLInputElement::HandleDOMEvent [d:\builds\seamonkey\mozilla\content\html\content\src\nsHTMLInputElement.cpp, line 1223] PresShell::HandleEventInternal [d:\builds\seamonkey\mozilla\layout\html\base\src\nsPresShell.cpp, line 6004] PresShell::HandleEvent [d:\builds\seamonkey\mozilla\layout\html\base\src\nsPresShell.cpp, line 5927] nsViewManager::HandleEvent [d:\builds\seamonkey\mozilla\view\src\nsViewManager.cpp, line 2043] nsView::HandleEvent [d:\builds\seamonkey\mozilla\view\src\nsView.cpp, line 306] nsViewManager::DispatchEvent [d:\builds\seamonkey\mozilla\view\src\nsViewManager.cpp, line 1863] HandleEvent [d:\builds\seamonkey\mozilla\view\src\nsView.cpp, line 83] nsWindow::DispatchEvent [d:\builds\seamonkey\mozilla\widget\src\windows\nsWindow.cpp, line 869] nsWindow::DispatchWindowEvent [d:\builds\seamonkey\mozilla\widget\src\windows\nsWindow.cpp, line 886] nsWindow::DispatchKeyEvent [d:\builds\seamonkey\mozilla\widget\src\windows\nsWindow.cpp, line 2660] nsWindow::OnChar [d:\builds\seamonkey\mozilla\widget\src\windows\nsWindow.cpp, line 2810] nsWindow::ProcessMessage [d:\builds\seamonkey\mozilla\widget\src\windows\nsWindow.cpp, line 3459] nsWindow::WindowProc [d:\builds\seamonkey\mozilla\widget\src\windows\nsWindow.cpp, line 1131] USER32.dll + 0x124c (0x77e7124c) 0x00120001

> Build ID 2002 03 11 06 stack trace shows: mozilla\editor\... Looks like a user trying to use the (HTML) editor for XHTML/MathML content. What is weird is that nsMathMLmphantomFrame::Paint() is actually an empty function: http://lxr.mozilla.org/seamonkey/source/layout/mathml/base/src/nsMathMLmphantomF rame.cpp#82 Marking WONTFIX since I have no clues what is happening.