Gerald,
[...] I made the change and it seems to work fine as long as "maintain screen coordinates" is set to yes. [...]
Are there any problems when it is set to "no"? I thought it was supposed to keep screen and image coordinates synchronised in that case.
No, but I changed it back because it broke the few PAR's I have already made.
I need to make it easier to zoom the screen size, since it has to be done by hand now.
Played around with those screen/image orbit features a bit and tended to do the following:
Zooming in with "maintain..." set to no. Finding an interesting place, but wanting to move or zoom in/out the image coordinates alone...
Now, switching to yes would revert the screen coordinates I want to keep.
I've fixed this. I'm going to take a look at the files included (for an official release) and adjust as necessary, then I'll put out a patch. Should be in the next couple of days. Jonathan