First, they are great and fun. One kept ganging on me while I was trying to move our base as a human. Also, they didn't whine when I moved RC without notice, that's cool too!
1) Probably related to niveus navmesh, when I built node @ crates here, bots weren't moving after spawning, I had to push them back and move nodes below. Also, anti-spawnblock doesn't work on them.
2) After building for humans, I did so for aliens too. I noticed they were getting stuck quite often, but this one was the most "serious". There were all six bots camping as rants, they only moved to U-Hall when a human was going this way, but returning shortly after they've killed him. It probably had something to do with the fact, that human base was right above them. I have also encountered a teammate bot in aliens default trying to go through wall, pointing at crates room (human base).
3) Couldn't manage to take a screenshot, but I've seen a human with saw rushing our base in window - he just stood in the entrance, pointing at the trapper and trying to kill it from afar. From what I've noticed, he wasn't trapped (but won't bet on it too!).