Symptoms: The user cannot open new PDF's. When we look on the TS process list, we can see multiple acrord32.exe's, one for each attempt to open a PDF after the hang occurs. The user/Citrix Control Panel can not see the process. After a while an error saying referring to the DDE service may pop up, but this is bogus error message as far as we can tell. (We have tried enabling the service too.)
We have been able to figure out that this happens consistently when the user uses the "x" on the right click "drop down" menu from the Windows taskbar in Vista/7 to close Reader, but it seems it can also occur when closed in other ways, although rarely.
It seems that only a few 5-10 of our 1000+ users get this error at all, and about 2-3 of them get it a lot more than the rest. This is at least partially because of patterns of use.
We run Windows 2003 R2 fully patched as of now. We run Presentation Server 4.5. We have tried Adobe Reader 6, 7, 8, 9, X. Same error on all.
Information on this is scarce, but we have been able to find a few posts on it. Most not offering any solution. The only solution suggested is to install the v 12 Xen (Citrix) client, but that doesn't help.
Some of the better posts describing the same error: http://tech.groups.yahoo.com/group/thin/message/144256
Any help would be very much appreciated.