I don't know why is so, but to avoid this situation do not assotiate timer to a window. Create a separate timer proc and provide a null HWND to SetTimer.
Are you maybe doing loads of stuff, consuming loads of resources, in the window and, therefore, not giving any chance to have the WM_TIMER (which are of extremely low priority) messages processed?
No. But definitly I did something wrong (but what?).
By the way one more problem has taken place that is when I initiate arising of MessageBox then it does not appear, (it is invisible actually), but appears only if I push Alt button. I had no similar problems while using SDI.
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