Guys - just to append to this, there's an issue raised in the 2.4 bug thread which may be related to reaction fire and alien panic but until I can reproduce it I can't send the logs over.
This is probably a dumb question, but while it benefits the project to send over the tracelogs, screenshots and saved games, it's not much fun having to restart a mission 5 or 6 times before I play it without seeing alien reaction fire (especially with needler) or alien panic forcing me to restart it - and I don't think the traces I'm seeing are as informative as they ought to be to help someone figure out what's locking it up.
Are there any commands that can be typed into the trace window to enable more watchers? Or failing that how easy would it be to put in a 10 minute timeout on an alien round after which point it logs "round never ended" and dumps all pertinent data into the trace before doing a cleanup and ending the round?