This morning when I called aMule back from the tray bar the window didn't react to any action and was blocked.
aMule used all 3 GB of ram and filled also 1.7 GB of swap!
After this it closed itself, but I don't know for what it was...and I can't reproduce it!
Nothing in log...so I think I'm not really helpfull...(<-- new word

)
I'm using SVN build 9748...
Stu: that typo was bugging me...