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When I've have this sort of problem on our Citrix farms it has usually been cause by issues with the user profile as you say.
Does the problem only occur on one of the servers, or on all of them?
Are you useing local profiles or roaming profiles?
Have you checked that there are no errors in the event logs when the user logs on, and just as importantly (if you are using roaming profiles) when they log off?
Are your servers configured to delete local profiles when the user logs off?
The other potential cause is that the user is presented with a desktop while the process which copies the profiles in is stalled - if you leave the desktop for a long time, do the icons eventually appear? I have had similar problems when the login process is trying to re-connect persistently mapped drives which map to a server that is down.
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