STCAgent Event id 2

We use terminal service for users logging into windows server 2003 R2. Every time someone logs into the server the following error is in the event log.

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Event Type: Error
Event Source: STCAgent
Event Category: None
Event ID: 2
Date: 6/4/2009
Time: 10:53:30 AM
User: N/A
Computer: CITRIX01
Description:
Termination reason code 10 [FAST_USER_SWITCH]
———————————————–

Can anyone give me a reason why this might be happening? I am not sure what other information to post with this. I have been searching the Internet for help, but haven’t been able to really find anything that is like this. It doesn’t seem to be causing a problem, but I don’t like seeing errors.

Thanks for any help you can provide.

dprows