msgina event 1010 errors

Finally managed to solve an issue that has been bugging me for months. A user was logging onto the Terminal server but two of their network drives would not connect as part of the login script. However doing a net use and providing username and password in the prompts would connect (which is how they've been connecting for a while). Logging into a local pc worked fine, but logging in via terminal services always had this problem - so it had to be something to do with the roaming terminal service profile.
Eventvwr was showing events Userenv 1030 - Windows cannot query for the list of Group Policy objects, Userenv 1006 - Windows cannot bind to domain.com domain (Invalid Credentials), MsGina 1010 Failed to set the user's home directory,
I tried debugging using KB221833 which gave me 43 pages of logs to read through.
Eventually I logged into the Terminal server as the user, went into control panel, stored passwords and lo and behold - there was someone elses username (and password). Deleted this stored account, logged off and back on again and got all their network drives connected.
control keymgr.dll is a shortcut to this screen that users might be able to use to clear this themselves.