MMC plugin not working


I'm trying to configure the MMC plugin on my Windows 8.1 machine. The installation runs fine and when I configure the plugin and press the "Test" button, it says "Connection established successfully". When I press "Ok" I get and error:
Could not find a part of the path 'H:\gwiseconfig.key'. I tried creating the missing file, but the error remains. I have this error on several machines. The only thing I can think of is that it has something to do with folder redirection, but we only use that to redirect the 'My Documents' folder.

What could be causing this? And where is this file normally stored?