By no means is any of this gamebreaking but I'm posting it for the sake of thouroughness. Both of these issues are new with Beta 3.
I have occasionally gotten "stuck" nebulae on the main screen. I can scroll all around the map but the nebula will continue to be displayed dead center of my screen. I can't figure out if there is a specific trigger, but once its there I have to reload the game to get rid of it. (I usually just play with it, not that big a thing)
The other thing is that the longer I play and the bigger the map I play I get some stuttering graphics like planets and ships that flash in and out of existence. I was inclined to think this was a performance issue on my computer but decided it might not be because this stuttering can happen even when I'm not doing anything at all. I'll just be sitting there looking at the map and rather abruptly I get graphics distortions. Again its just an annoyance and I can usually clear it up simply by reloading the game.
-Pleth
