Windows cannot copy file \\domain server\netlogon\manProfiles\Mandatory proflle

My users are getting an error this morning:
"Windows cannot copy file \\domain server\netlogon\manProfiles\Mandatory profile to location C:\documents and Settings\%username%.
I'm running Windows Server 2003 SP2 and Citrix PS 4.0. Nothing has changed overnight that I know of, this has been working for several years with no problems.
All the network servers seem to be working OK, Active directory seems OK but about half my users can't log in because of this. And it seems to be intermittent for some. A few after rebooting get logged in and others don't. Administrators are working fine but were not tied down by the Mandatory profiles. I've looked for viruses but can't find any.
Any suggestions on where to look for causes?
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Mike5978Asked:
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Mike5978Author Commented:
Problem solved?
I ran windows update on 6 of my 8 citrix servers yesterday morning which applied 9 patches. After trying everything else to solve the problem I took the 6 servers offline last night and tried logging into the two "unpatched" servers. Loggin worked no errors, so I assumed that the patches must be the culprit. I started backing off the patches on one of my patched servers and discovered that patch KB980232 was the source of the problem. This patch according to MS has to do with Vulnerabilities in the SMB Client. The only thing I can think of is that it affected file sharing in some way that caused the problem in the first place, but that's for smarter people to figure out. For me, my users are logging in this morning and the problem is solved.
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Windows Server 2003

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