Lets start by taking a look under "c:\Users" if you find multiple TEMP.DOMAINNAME.XXX folders then read on.
You may see the following two events logged together in the Application Event Log on the SBS 2011 Server and both reference the DOMAINNAME\spwebapp
Log Name: Application
Source: User Profile Service
Event ID: 1500
Lvel: Error
Windows cannot log you on because your profile …
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