update - April 5 - this does not fix the problem. the closest workaround i have is to make the client go full screen. that way, there is no window area to get stuck in.
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I just noticed this on my system. It happened a few times on a system at the office. My system is Win2k and the other one is '98. We were both running version 6-something of the client, so I upgraded both. Dunno if it's fixed .. intermittent issues are sooo fun to troubleshoot.
The only two articles on this trouble at Citrix are:
Mouse stuck inside of citrix area
Mouse stuck in "client area" with ICA client
( Win2K Win98 Windows 2000 Windows 98 Citrix Metaframe Client )