Hmm, how very strange One thing, the nasty casting to AFX_THREADPROC isn't really a good idea, change your function prototypes to be UINT ThreadProc(LPVOID) and then cast the void paramter to the correct type in the thread. What platform are you using (as in VS.NET/VC6)? Also, try in your SlowThread just calling critsection->Lock() (ie doing away with the CSingleLock class) what happens then?

An earlier version of DX will give you DirectDraw, a 2D API which will be much easier to use that OpenGL. Christian NO MATTER HOW MUCH BIG IS THE WORD SIZE ,THE DATA MUCT BE TRANSPORTED INTO THE CPU. - Vinod Sharma Anonymous wrote: OK. I read a c++ book. Or...a bit of it anyway. I'm sick of that evil looking console window. I think you are a good candidate for Visual Basic. - Nemanja Trifunovic

Redesign your app. 18 checkboxes in one dialog is just too much. And use a listview, a tree with checkboxes, whatever. I don't think this is a serious possesion, and the evil most likely comes from your hand. Colin J Davies, The Lounge