Yesterday or the day before, I had asked matty about the potential grid option and when I told him that it wasn't working for me, he showed a screenshot of it, so it's working for him, but I don't see any gravity well, even checked with black holes and nothing.
I'll check the latest driver update just to be sure that it isn't a version issue.
Also, is anybody else having this issue? I don't know what information gets sent through the feedback thing other than the text, email, and possibly a screenshot.
Edit: Updating the graphics driver didn't help. However, while looking in the Ubox2 alpha folder, I looked at the output file and saw that there were a bunch of errors relating to the potential grid. I'm uploading it since it may help you guys.