Plus, when I delete file/press Del, XnView's window disappears and swaps Z-order with the window underneath. Then I have to click on the taskbar to switch back to XnView window. Also, often upon deleting file, the window becomes unresponsive to keyboard and mouse messages, and I can only do actions by clicking the toolbar or window's close button. I thought it's related to Vista's Flip3d, but it isn't (I'm running Vista SP2 Home Premium).
If the (current) file I delete is the last one by file order, it jumps to the first file, but I guess that's expected action.
Aero, etc. make no difference. I tried all combinations of "Read one image ahead" and "Keep current image in cache" options, but nothing fixes the "disappearing window" glitch. I don't have Win7 machine to test on it, and there are no problems on XP.
A wild shot, but I would say that the problem is in the application's message pump (

Btw., still no Unicode? Just basic file I/O would do for now, leave EXIF stuff for later.