Reference problem post : http://forums.citrix.com/thread.jspa?messageID=1409280 Here is my environment : Windows 2008 SP2 with MUI pack installed and Citrix XenApp 5 with latest hotfixes and Citrix Edgesight XenApp Agent 5.1 . I get this error when I open a console on the XenApp servers and it seems to popup in some user's session... Click on read more to continue... Problem signature:   Problem Event Name: BEX Application Name: CtxHide.exe Application Version: 5.0.0.5357 Application Timestamp: 48a7429b Fault Module Name: apphelp.dll Fault Module Version: 6.0.6002.18005 Fault Module Timestamp: 49e036f3 Exception Offset: 000012a5 Exception Code: c0000005 Exception Data: 00000008 OS Version: 6.0.6002.2.2.0.16.7 Locale ID: 1036 Additional Information 1: fd00 Additional Information 2: ea6f5fe8924aaa756324d57f87834160 Additional Information 3: fd00 Additional Information 4: ea6f5fe8924aaa756324d57f87834160 Read our privacy statement: http://go.microsoft.com/fwlink/?linkid=50163&clcid=0x0409 And in the system's event log : Log Name:      Application Source:        Application Error Date:          29/09/2009 14:40:59 Event ID:      1000 Task Category: (100) Level:         Error Keywords:      Classic User:          N/A Computer:      EMCXPA1031.emea.cib Description: Faulting application CtxHide.exe, version 5.0.0.5357, time stamp 0x48a7429b, faulting module apphelp.dll, version 6.0.6002.18005, time stamp 0x49e036f3, exception code 0xc0000005, fault offset 0x000012a5, process id 0x18a0, application start time 0x01ca410218e4f98f. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Application Error" /> <EventID Qualifiers="0">1000</EventID> <Level>2</Level> <Task>100</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2009-09-29T12:40:59.000Z" /> <EventRecordID>3694</EventRecordID> <Channel>Application</Channel> <Computer>EMCXPA1031.emea.cib</Computer> <Security /> </System> <EventData> <Data>CtxHide.exe</Data> <Data>5.0.0.5357</Data> <Data>48a7429b</Data> <Data>apphelp.dll</Data> <Data>6.0.6002.18005</Data> <Data>49e036f3</Data> <Data>c0000005</Data> <Data>000012a5</Data> <Data>18a0</Data> <Data>01ca410218e4f98f</Data> </EventData> </Event> I found some guys who have exactly the same issue and it seems MUI related, the thread on the Citrix's forum is here : http://forums.citrix.com/thread.jspa?messageID=1409280 . Update 01 October 2009 10:00am : I got a dump of this crash : ******************************************************************************* *                                                                             * *                        Exception Analysis                                   * *                                                                             * ******************************************************************************* Unable to load image c:\Program Files (x86)\Citrix\System32\ctxhide.exe, Win32 error 0n2 *** WARNING: Unable to verify timestamp for ctxhide.exe Unable to load image C:\Windows\System32\csma_ldr32.dll, Win32 error 0n2 *** WARNING: Unable to verify timestamp for csma_ldr32.dll *** ERROR: Module load completed but symbols could not be loaded for csma_ldr32.dll ************************************************************************* ***                                                                   *** ***                                                                   *** ***    Your debugger is not using the correct symbols                 *** ***                                                                   *** ***    In order for this command to work properly, your symbol path   *** ***    must point to .pdb files that have full type information.      *** ***                                                                   *** ***    Certain .pdb files (such as the public OS symbols) do not      *** ***    contain the required information.  Contact the group that      *** ***    provided you with these symbols if you need this command to    *** ***    work.                                                          *** ***                                                                  …