iirc, it's a known wx bug. there's a way to see the context emnu with some keyboard key afaik, but don't know which (i guess you know which key/s anyway). If you need help about the context menu, you can join #macmule or #amule and ask Mac ppl there how they do it ;-) (btw, you'll have to wait sime long time until someone answers, since ppl do not tend to stay the whole day in fron of the irc waiting for questions :-P)
Greetings!