I've noticed this happen a few times, and I do not really know why. It usually occurs a few hours or more into a game (I don't think I've ever had it happen within the first hour). When I try to group ships into a fleet (usually its with just 2 ships) they wont, but itll create this phantom 3rd ship thing with no picture. You cant move it, but you can disband it. And from then on, one of those two ships will NEVER be able to be grouped/fleeted with any others. (Yes, I had enough logistics points).
And now for the new (but fun twist), the dropship of doom. The afformentioned bug happened with a troopship of my own making. It wouldnt fleet, and if I tried it just made some non-existant 3rd icon that didnt do anything. Yet when I sent it to an enemy planet to die just to get rid of it (and my troops lost) BUT afterwards, the ship was still there. I could keep using it (or its clone?) to attack a planet until I had killed off all the opposing troops. I musta conquered like 5 planets with it.
As for other bugs, I've had the end turn button dissapear (usually after several hours of playing) but fiddling with it (chaging zoom level and moving around) sometimes brought it back
.
I've also had it where the screen gets really really dark, like the gamma shoots way way down, and I cant see anything, and it almost always happens after I press endturn, and its busying trying to move all the ships and autosave. A simple save and quit and restart fixes the problem.
System specs: the 1.0x patch (not the 1.1 beta)
p4 2.4c with HT
1gb ddr ram
ATI Radeon X850 Pro with 6.2 catas.
SB Audigy 2 Gamer soundcard (with default drivers)
100gb+ of freespace on HDD.
WinXP Pro Sp2 fully up to date.