Alt+Tab causes SoulseekQt to just disappear

I'm a newbie who just started using SoulseekQt today (4-10-2013 build). I had it running for awhile, downloading stuff, when I went to look at other stuff on the internet, and when I tried to go back to SoulseekQt, it had just disappeared from my taskbar, and the task manager didn't have it in the applications. I couldn't actually run it again until I went under processes in the task manager and ended SoulseekQt.exe that way, and then open it from my programs folder. This kept happening 3-4 times, and I finally noticed when it disappeared after only a few minutes and only downloading a few small files, that pressing alt+tab seemed to have done it. I'm using Windows 7, and I don't think this counts as it crashing, in fact I think the files keep downloading and everything, it's just that the SoulseekQt application vanishes. Has anyone else had this happen, and is there anything I can do about it?