XnView Software

If I set the mousewheel modifiers all to the same value - I tried zoom & move file - and scroll the wheel back and forward, with or without breaks (releasing fingers from both), I find that No-Modifier, Ctrl and Shift work as expected but Alt-Mousewheel is temperamental and works for a little bit but quickly gets stuck not doing anything, which using one of the other modifiers (same setting!) then breaks out of.

Can anyone reproduce this?