I'm getting the "inventory full" popup messages when trying to loot an item, but my inventory is far from full. I've got 10 open slots.
This is in the latest version.
I used to assume that BYOND was just ignoring the mouse clicks because, well, it likes to do that. Now that you have the error message it seemed more likely that this was an issue with the game, though it was still only happening when things got laggy. I tried hosting this in DD and connecting locally and was getting bogus "inventory full" messages even when the game wasn't laggy.
Also, the game still maxes out my CPU and gets choppy, even when I run it in DD and connect through DS locally :-/ What's the game's framerate? If it's easily possible, maybe you could add an option to reduce the framerate. If the game ran smoothly at 35 fps instead of being sometimes laggy at 40 fps, I'd prefer that.