Safari Window text input process hangs on edit

Question

My friends iMac has an issue when a text box on a web page is changed, e.g. with a [delete] key. He is running latest Yosemite/Safari.The process hangs with the following message in the syslog:Oh, I didn&#x27;t get that message sent here to me, just the trace, but it was looking for a nibAddressBook... something, something, trying to work on completions.The trace is following.I can kill the sandbox process related to the text input in activity monitor and get control of the window back.This error started happening a couple days ago.  The error doesn&#x27;t happen on the guest account.  I cleared the Safari cache and tried in safe mode with the same results.Any operation to modify the text in a text input field causes the error, but edits on the URL input box work fine.  I can paste text, so I have him using textedit for now and pasting in his info to get around the issue.Here is the trace:10/6/15 10:13:11.142 AM Safari[1145]: (  0   CoreFoundation                      0x00007fff97ab203c __exceptionPreprocess + 172  1   libobjc.A.dylib                     0x00007fff936e376e objc_exception_throw + 43  2   CoreFoundation                      0x00007fff97ab1eed +[NSException raise:format:] + 205  3   AppKit                              0x00007fff98a18d34 -[NSNib initWithNibNamed:bundle:] + 347  4   Safari                              0x000000010e4168d1 -[FormCompletionControllerObjCAdapter _registerTableViewCellClasses] + 93  5   Safari                              0x000000010e4161e9 -[FormCompletionControllerObjCAdapter initWithFormCompletionController:] + 75  6   Safari                              0x000000010e413512 _ZN6Safari24FormCompletionController17createObjCAdapterEv + 50  7   Safari                              0x000000010e329794 _ZN6Safari20CompletionController18installObjCAdapterEv + 18  8   Safari                              0x000000010e40dc54 _ZN6Safari24FormCompletionController6createEP8NSWindowRKNS_2WK5FrameERKNS3_10Di ctionaryES9_ + 88  9   Safari                              0x000000010e25fa2d _ZN6Safari28BrowserContentViewController38createFormCompletionControllerIfNeede dERKNS_2WK5FrameERKNS1_10DictionaryES7_ + 1191  10  Safari                              0x000000010e25fe47 _ZN6Safari28BrowserContentViewController23autocompleteInTextFieldERKNS_2WK5Fram eERKNS1_10DictionaryES7_ + 29  11  Safari                              0x000000010e2603a7 _ZN6Safari28BrowserContentViewController24textDidChangeInTextFieldERKNS_2WK5Fra meERKNS1_10DictionaryES7_ + 511  12  Safari                              0x000000010e27a899 _ZN6Safari28BrowserContentViewController13handleMessageEP8NSStringRKNS_2WK4Type E + 2277  13  Safari                              0x000000010e285383 _ZN6Safari34BrowserContextInjectedBundleClient15dispatchMessageEP8NSStringRKNS_ 2WK4TypeE + 55  14  Safari                              0x000000010e284d1e _ZN6Safari34BrowserContextInjectedBundleClient35didReceiveMessageFromInjectedBu ndleERKNS_2WK7ContextERKNS1_6StringERKNS1_4TypeE + 40  15  Safari                              0x000000010e33ffdb _ZN6Safari2WKL35didReceiveMessageFromInjectedBundleEPK15OpaqueWKContextPK14Opaq ueWKStringPKvS8_ + 93  16  WebKit                              0x000000010fb7aa06 _ZN6WebKit30WebContextInjectedBundleClient35didReceiveMessageFromInjectedBundle EPNS_14WebProcessPoolERKN3***6StringEPN3API6ObjectE + 162  17  WebKit                              0x000000010fc24997 _ZN6WebKit14WebProcessPool13handleMessageERN3IPC10ConnectionERKN3***6StringERKN S_8UserDataE + 77  18  WebKit                              0x000000010fc2c19b _ZN3IPC13handleMessageIN8Messages14WebProcessPool13HandleMessageEN6WebKit14WebP rocessPoolEMS5_FvRNS_10ConnectionERKN3***6StringERKNS4_8UserDataEEEEvS7_RNS_14Me ssageDecoderEPT0_T1_ + 103  19  WebKit                              0x000000010fc2bfe5 _ZN6WebKit14WebProcessPool17didReceiveMessageERN3IPC10ConnectionERNS1_14Message DecoderE + 91  20  WebKit                              0x000000010faada50 _ZN3IPC18MessageReceiverMap15dispatchMessageERNS_10ConnectionERNS_14MessageDeco derE + 120  21  WebKit                              0x000000010fc2e36e _ZN6WebKit15WebProcessProxy17didReceiveMessageERN3IPC10ConnectionERNS1_14Messag eDecoderE + 46  22  WebKit                              0x000000010fa7447c _ZN3IPC10Connection15dispatchMessageENSt3__110unique_ptrINS_14MessageDecoderENS 1_14default_deleteIS3_EEEE + 102  23  WebKit                              0x000000010fa7697e _ZN3IPC10Connection18dispatchOneMessageEv + 114  24  JavaScriptCore                      0x000000010f33336d _ZN3***7RunLoop11performWorkEv + 429  25  JavaScriptCore                      0x000000010f333a82 _ZN3***7RunLoop11performWorkEPv + 34  26  CoreFoundation                      0x00007fff979cea01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17  27  CoreFoundation                      0x00007fff979c0b8d __CFRunLoopDoSources0 + 269  28  CoreFoundation                      0x00007fff979c01bf __CFRunLoopRun + 927  29  CoreFoundation                      0x00007fff979bfbd8 CFRunLoopRunSpecific + 296  30  HIToolbox                           0x00007fff90b2256f RunCurrentEventLoopInMode + 235  31  HIToolbox                           0x00007fff90b222ea ReceiveNextEventCommon + 431  32  HIToolbox                           0x00007fff90b2212b _BlockUntilNextEventMatchingListInModeWithFilter + 71  33  AppKit                              0x00007fff988a48ab _DPSNextEvent + 978  34  AppKit                              0x00007fff988a3e58 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 346  35  Safari                              0x000000010e240226 -[BrowserApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 246  36  AppKit                              0x00007fff98899af3 -[NSApplication run] + 594  37  AppKit                              0x00007fff98816244 NSApplicationMain + 1832  38  libdyld.dylib                       0x00007fff9196e5c9 start + 1  39  ???                                 0x0000000000000001 0x0 + 1)