Profile corruption

Hi everyone

We are currently running an interforest migration using ADMT 3.0.
Most of the workstation migrations go without a hitch but we have been
getting a number of them which get the following when they try and log onto
the new domain after the migration:

"Windows cannot load the locally stored profile: Insufficient security
rights or a corrupted local file. Windows has logged you in with a temporary
profile any setting you make will not be saved"

They then get a temporary profile when they log on. The only way to get
around this seems to be to give their domain user local administrator rights
on the workstation.

This shouldnt be the correct behaviour surely?
I have gone through the logs and can't see anywhere where the migration tool
has failed.

Your assistance is much appreciated!