I use version 0.24.1 in Win XP SP2.
It already happens several times that my PC hangs completely after disconnecting the program from downloading, i.e. clicking on the connect button. The only solution was restarting the PC. And on few of these occasions my whole download list had disappeared, so I had to load all the NZB-files again. Very annoying (although I like the program).
Floortje