XnView Software

Yepp!
Thanks the hint. That was the problem!
Now I changed the positions of the two monitors. Now primary is on the left side.

When I tried to figure it out, I've noticed that the main windows position automatically changed if it was in negative position.

Thanks the help again.

Bye

Still not for me. (1.96.5)
on XP SP2,
nVidia 8800 GT, Omega driver, version: 2.169.21,
Two monitors: lefty is the secondary (res: 1280x1024, shift: -1280x48), on its right is the primary (res: 1920x1200)

Thanks in advance