Users accessing application via citrix metaframe. Inside of application receive error Invalid date format. Found that if an administrator rights userid logs in from same user workstation the administrator user does not get same message. System was updated recently to Service pack 4. Verified the inernational key, both sdate and longdate. Tried insert a registery key via the winlogon.cmd to force the date long and short format . These did not resolve the problem. Had to us an a user with administrtor rights to resolve the issue.