Absolutely bizarre, By using pythonw.exe to run it I will get the following error when I try to install a mod on the Installers tab Traceback (most recent call last): File "C:\games\oblivion\Mopy\basher.py", line 6936, in Execute self.data.install(self.filterInstallables(),progress,last,override) File "C:\games\oblivion\Mopy\bosh.py", line 11501, in install installer.install(archive,destFiles,self.data_sizeCrcDate,SubProgress(progress,index,index+1)) File "C:\games\oblivion\Mopy\bosh.py", line 10688, in install self.unpackToTemp(archive,dest_src.values(),SubProgress(progress,0,0.9)) File "C:\games\oblivion\Mopy\bosh.py", line 10656, in unpackToTemp ins = Popen(command, stdout=PIPE, startupinfo=startupinfo).stdout File "c:\python26\lib\subprocess.py", line 614, in __init__ errread, errwrite) = self._get_handles(stdin, stdout, stderr) File "c:\python26\lib\subprocess.py", line 722, in _get_handles p2cread = self._make_inheritable(p2cread) File "c:\python26\lib\subprocess.py", line 761, in _make_inheritable DUPLICATE_SAME_ACCESS) WindowsError: [Error 6] The handle is invalid If I use python.exe it works fine except for the darn command window staying open. At least I can run it but there is some oddity going on and I have this obsessive need to solve iit.