DirectX Problem

when you gain focus again, just restore your surfaces with the Restore() member of IDirectDrawSurfaceX

ie. surface->Restore();

Just a few things.

If you''re using DirectX 7 just call
llpdirectdraw7->RestoreAllSurfaces();

it''s new to version 7 and is a great shortcut.

And another thing, by restoring the surfaces, it doesn''t restore the contents of them, it merely "re-grabs" the memory where the surface will reside. It''s not likely, but possible that the surfaces will be written over. You will need to load all of your graphics back onto the surfaces after restoring them just to be sure though.