Mercurial fatal error when pulling

[Mark]

When trying to pull from a branch I keep getting this error

pulling from xxxxxxxxxxxxxxx
searching for changes
adding changesets
adding manifests
adding file changes
abort: Permission denied: None
transaction abort!
rollback completed
when run with "-v" I get this

pulling from xxxxxxxxxxxxxx
searching for changes
found new changesets starting at 9b1e11784558
adding changesets
adding manifests
adding file changes
abort: Permission denied: None
transaction abort!
rollback completed

This happens with version
Mercurial Distributed SCM (version 0.9+20060511)
on Win32 (XP and Win2003 Server)
with multiple different branches.  some small some large.  Many times it
will hapen after only a single commit.

-Mark
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