I tried:
Deleting or changing the settings files (C:\Users\UserName\Documents\Visual Studio 2012\Settings\CurrentSettings.vssettings) is only a temporary fix because Visual Studio recreates/overwrites this file each time you update a setting or close Visual Studio.
Using a team settings file doesn't work either because that file won't overwrite a parameter that's not in listed in the CurrentSettings.vssettigs file. And it won't be listed in the CurrentSettings.vssettigs file after you close Visual Studio and the file gets regenerated.
* I see 3 options *
1. Recompile GitExtensions with the modification noted here: https://github.com/gencer/gitextensions/commit/faef52e8191fde54ef9787f6f5156cf315ec9be5 This is not easy because the project includes a bunch of third party libraries that have to be installed and configured. Good Luck!
2. Use this .dll that was fixed by someone else. http://mirror.nienbo.com/git-extensions/patch_for_244/GitPlugin.dll After you download it, right click on it, select properties, and press the "unblock" button. Then copy it to C:\Users\UserName\Documents\Visual Studio 2012\Addins (overwriting the current file). This worked great for me.
3. Use a different git extension program.