Dreamcast VMU makes controller stop working when plugged in.

I have an OEM VMU that makes the controller stop working when it is plugged into a controller with the console power on. I've tried this both with and without batteries. Any idea what the issue might be? I have tried cleaning the contacts to no effect. I have a third party memory card that works just fine.

If I go into the file menu and plug in the VMU, the controller disappears, and then reappears when the VMU is removed. I've heard different things about this issue, such as a short circuit happening somewhere, the smd capacitors on the controller's board being bad, a fuse somewhere being blown, and oxidation on the contacts.
 
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