Forward / Next picture in folder does not work.

[RayTomes]

The keystrokes for Forward / Next picture in folder have stopped working some time ago.
In the view menu, the next (and previous) file in folder items are light grey. I cannot work out how to make them reappear. AFAIK I didn't do anything to make this happen. I used to use this feature all the time.HELP! How do I make it work?
I am on Irfanview 4.59 64 bit on Windows 10.
Ray

[RayTomes]

I decided that people would tell me to reinstall, so I did and it works now.
Except all my nice settings are stuffed up.