I guess I'll post a couple.
Moon-blackhole collision strangeness (then again, black holes are strange):
When doing the collide moon with blackhole, the moon instantly turns into a star with an exact mass of 1 Sol. However, repeats of that same collision have the moon turn into a red dwarf rather than a G type star. Though if I have it pause the sim at start and go realtime (well, slightly faster than realtime), it always turns into a 1 solar mass star (no idea if diameter is correct). Doing it at 0.100 sec timescale makes it turn into a red dwarf each time.
Going at 50 ms/sec produces stranger results, sometimes both objects simply vanish, but a few times I saw (for a split second) a big bright blue asteroid surrounded by whiteness before vanishing. Checking it out at about 1 ms/sec, and same results with sometimes vanishing alltogether and sometimes showing that blue asteroid for the briefest of instances before completely vanishing.
Had to compress it because attachment file size limit.
(second log is for this one) The explode hotkey doesn't work and there isn't any explode button, tried exploding Mercury in the opening sim, both at max and min energy. Also, the force power doesn't seem to work, or maybe I don't know how to use it.