What can stop the Up Down arrow keys from working in a browse?

Off line Win10 PC, but cant say who might be coming into the house whilst I’m out walking the dog, but I know people have been in the house in the past and wiped my backups drives.

All of a sudden a browse box doesnt want to scroll past the visible records in either direction.

Any ideas?

TIA

Sometimes scroll lock can wreak havoc

I think its all tied to this post WindowManager.Update calling BrowseClass.UpdateViewRecord - RC = ErrorCode() - Error 78 Invalid Number of Parameters

If I click on one of the column headers as I have column header sorting enabled, the up and down and page up and page down buttons work.

Its on a key with two elements which total 2052 bytes in length, so by clicking on the column header is removing the key from the equation.

The problem is related to the Position() being greater than the Queue ViewPosition.

A fix is posted here WindowManager.Update calling BrowseClass.UpdateViewRecord - RC = ErrorCode() - Error 78 Invalid Number of Parameters