Ok, not sure where you people are getting your LSD but here's some more specifics:
A guild-mate and I did some thorough testing in a GvG sector, playing with different combos and such, and there still seems to be a problem and I bet you can replicate it.
Your attack army: 1 rail gun, 7 rogues
The pattern is that your very first rail gun to fire can't hit drones or hover tanks on plains. It will hit a tank that reveals itself by moving onto non-plains terrain, it will hit a spotter, it will hit an exo soldier, it will hit another rail gun, it will hit a champ. But not a drone or a TE/FE tank on plains under stealth. The rail gun is highlighted, as if it's turn to move, and you can move him around but no matter how much you click, he will not attack those unit types. But it's only that first rail gun on that first round that cannot do so. In the 2nd round and beyond, it can fire at everything as it's supposed to.
So lets say you're fighting 3 tank, 3 rogue and 2 drones. Your only choice for your first attacking move is to pop one of the rogues or click the gun to pass it's turn without firing. Boo.
I tried attacking several different army combinations, and this pattern holds true across everything I tested, and my guild-mate had the exact same results as I did. This is not imagined. Maybe it's not consistent across all players and all servers, but it's certainly an issue on E world for me and a guild mate.
I've contacted support with this info, just waiting to hear back.