Después de tanto tiempo buscado, he encontrado esto
:
Terminal Server appears to create a temp folder for
each user including appropriate rights.
If the server is not brought down properly then the
temp dir is not deleted and a subsequent user that
logs in may be assigned an existing temp dir with
someone elses rights.
A possible solution would be to delete all files and
temp directories in the temp directory when the NT
server boots up each time.
Si borrando la carpeta temporal deja de dar el error, os lo diré.
