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Recently had issue in XenDesktop where IE would just randomly crash. No event logged nothing!
Now I find there's a few ways that you can troubleshoot this problem.
Log directly in to a vDesktop and see if you can replicate the issue.
Check\Change the version of Citrix Receiver that is install on the endpoint.
Check\Change the version of flash that is installed on the endpoint.
If none of the above point you in the right direction try deleting the following regkey from the vDesktop and updating your MCS or PVS image.