I don't know.
What you can do (to fix this) is to go to a command prompt.
Issue a
net use
this will show all your mapped drives. Now, find the drive that you're interested in, and disconnect all the drives that map to that computer, like this:
net use driveletter /d
Once they're all disconnected, remap the drive like this:
net use driveletter \\computername\sharename /u:Domain-or-computername\userid *
Don't forget the * at the end of the line, that's what will force it to prompt you for the password that matches the userid you've specified.
Does this help?