Groove Agent One Preset

I work on two computers, and I recently created a drumkit on one of these. When I tried to copy this preset (‘mypreset’.vstpreset) to my second computer, it does not show up in Media Bay, nor in Groove Agent One.

The drum samples were all from the standard Groove Agent drumkits.

What am I doing wrong? From what I read on forums, copying presets should be quite straightforeward.