getting "Access is denied" message upon commit when using latest version of TortoiseGit

By bernd.pfrom... on March 08, 2013 14:09 (imported from Google Code)

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What steps will reproduce the problem?

1. upgrade to TortoiseGit 1.8.1.1
2. upgrade to git version 1.8.1.msysgit.1
3. try and commit a change

What is the expected output? What do you see instead?

Before the upgrade, adding files to the index and commiting worked just fine. Now I get:

Get error message: Could not add "foo.txt" to index.
libgt2 returned: Failed to rename lockfile to 'P:/repository/.git/objects/1a/10576ed52e5d278ca66581bc00cdfe397597da6': Access is denied

when trying to commit. Using git bash from the command line works fine, just not when using Tortoise GIT through Windows Explorer.
The P: drive is a samba share sitting on a linux server, but I can read/write the files just fine, and everything worked great until I upgraded to the latest TortoiseGit and msysgit versions.

What version of TortoiseGit and msysgit are you using?

TortoiseGit 1.8.1.1
1.8.1.msysgit.1

On what operating system?
Windows 7

Please provide any additional information below.