Alt + F1 hotkey does not always work

[FKCapitalism2]

I don't know what causes it i have Photoshop.exe assigned to Alt + F1 lots of times after working on image and keeping Photoshop open (not closing actual executable) just closing image after editing and keeping Photoshop running i then press Alt + F1 and nothing happens.

Not always though so reproducing might be difficult.

When i right click on thumbnail and select first option which is Photoshop instead of pressing Alt + F1 then it opens image in Photoshop.

So only thing not functioning sometimes is Hotkey.

[jkm]

Try a different F key, or try different modifiers (like Ctrl+Alt+Shift+F1). If the alternate works consistently, you might have something else on your system trying to also map Alt+F1, causing conflicts. That wouldn't be an XnViewMP issue; it's a known complication with Windows.