My loadout never exceeds the limits of the inventory though. Everything was fine until I ran into this random issue a few games ago. I haven't really changed strategy or items either. In one game I bought the missile launcher in the countdown stage and it was just left on the floor, I couldn't remove the light cannon from my inventory and in previous games, the cannon had been switched to missile automatically.
This game is absolutely awesome. I played for the first time this morning and have been playing pretty much all day >_>. I've run into an issue with the inventory system though. It was fine all day, then two or three games ago it decided it would no longer let me change or upgrade weapons, they are just left on the floor around the buildings regardless of level.
I hadn't looked at the inventory system before the issue occurred, as it switches everything automatically for you but the inventory system just had a bunch of green stop signs as items when opening it during the bugged games. I reset SC2 but that didn't help, will try a full system reset and see it it helps.