Having problems with 'a few' aircraft as well. This is in Sept. 1944 in the 'channel' between Ireland and England (had some fun with a convoy there). There are 8 aircraft in this pic, and there were a few more around as well:
Amazingly, none of them crashed though.
I can't remember if this was before or after installing RUb, but RUb should take of the high number of aircraft, right? So this is probably before.