1. Go to <http://youtube.com/> 2. Pick a video and start watching it 3. Pause 4. Open preferences and disable plug-ins 5. Close the prefs window 6. ASSERT! ASSERTION FAILED: eventModel == NPEventModelCocoa (/Users/matt/Code/WebKit/WebKit/mac/Plugins/WebBaseNetscapePluginView.mm:1951 NSArray* -[WebBaseNetscapePluginView validAttributesForMarkedText](WebBaseNetscapePluginView*, objc_selector*)) Thread 0 Crashed: 0 com.apple.WebKit 0x001a1330 -[WebBaseNetscapePluginView validAttributesForMarkedText] + 74 (WebBaseNetscapePluginView.mm:1951) 1 com.apple.AppKit 0x92d36b71 -[NSTSMInputContext initWithClient:] + 165 2 com.apple.AppKit 0x92d3696a +[NSInputContext inputContextWithClient:] + 81 3 com.apple.AppKit 0x92c83424 -[NSView inputContext] + 143 4 com.apple.WebKit 0x001a0e15 -[WebBaseNetscapePluginView inputContext] + 121 (WebBaseNetscapePluginView.mm:1886) 5 com.apple.AppKit 0x92bfa016 +[NSInputContext currentInputContext] + 285 6 com.apple.AppKit 0x92bf9edd +[NSInputContext updateInputContexts] + 52 7 com.apple.AppKit 0x92bf996d -[NSApplication updateWindows] + 117 8 com.apple.AppKit 0x92bf9897 _handleWindowsNeedUpdateNote + 67 9 com.apple.CoreFoundation 0x944819a2 __CFRunLoopDoObservers + 466 10 com.apple.CoreFoundation 0x94482d05 CFRunLoopRunSpecific + 853 11 com.apple.CoreFoundation 0x94483cf8 CFRunLoopRunInMode + 88 12 com.apple.HIToolbox 0x915f1da4 RunCurrentEventLoopInMode + 283 13 com.apple.HIToolbox 0x915f1af6 ReceiveNextEventCommon + 175 14 com.apple.HIToolbox 0x915f1a31 BlockUntilNextEventMatchingListInMode + 106 15 com.apple.AppKit 0x92bf8505 _DPSNextEvent + 657 16 com.apple.AppKit 0x92bf7db8 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128 17 com.apple.Safari 0x00007c7e 0x1000 + 27774 18 com.apple.AppKit 0x92bf0df3 -[NSApplication run] + 795 19 com.apple.AppKit 0x92bbe030 NSApplicationMain + 574 20 com.apple.Safari 0x000b4de6 0x1000 + 736742
<rdar://problem/6020296>
I cannot reproduce this with ToT.