Not sure if this is specific to your ROM or the latest Android updates, but I get this error on 8/27 (and didn't get it on latest MightyROM):
Code:
An unexpected error has occurred in MJGDroidUtil.exe.
Select Quit and then restart this program, or select Details for more information.
File or assembly name 'System.Core,Version=3.5.0.0, Culture=neutral, PublicKeyToken=969DB8053D3322AC', or one of its dependencies, was not found