I believe I found a bug in v4.41... I tried to swap the page up/page down keys for zooming in and out. When I did, the program would
only zoom in, but not out regardless of which key I pressed. I checked the INI file and found that the correct values were written (33 and 34) so it seems that the program is perhaps using a hard coded value rather than the ones read in from the INI file. Swapping them back to their original values worked as expected. In other words, this works:
ZoomInKey=33
ZoomOutKey=34
but this does not:
ZoomInKey=34
ZoomOutKey=33