While this isn't a game breaking glitch, it does affect the game quite a bit, I think.
If you find a planet with lots of ore, you can repeatedly drag ~900 ore onto your fleet inventory.
Doing this, I was able to slowly drag 10000 ore to a mothership, and earn some big bucks relatively quickly. (around 30000 IGC in a few minutes)
I would recommend a carry limit of 2 times the carry capacity with which you can still move at full speed, so people can't abuse this bug, though other solutions are fine, of course.
Well, off to abuse this glitch while I can!