This is more of a Citrix question, but their support site is not very helpful and I can't find a specific Citrix forum on this site.
When our users log in to our Citrix server (Citrix Metaframe XP Feature Release 3 on Windows 2003) they get the following error:
SAS window: winlogon.exe - Application Error
The instaruction at "ox..." referenced memory at "0x..". The memory
could not be "written".
Click OK to terminate the application.
When they click OK, the session closes. We have applied every hotfix available on Citrix's site.