You can do a registry fix to make it work with the big button task manager as well:
Set this regkey in regedit:
HKCU\Software\HTC\TaskManager\EnableAutoKill=0
It is HTC Taskmanager wanting to close the program automatically.
Props to Sonny486 for this! This problem was KILLING me! I would have to soft reset to be able to use my contacts, and do you know how hard it is to juggle all of that while driving
