Hi Rick,

re:
> After swiping across the curve to trim away I get a 'beachball' for maybe 15 seconds and then
> every intersecting line on the entire model is 'broken' by inserting a point at the intersection- another
> 10 or 15 seconds and the section I wanted trimmed is gone.

This likely has more to do with your particular model than being on Mac, can you please send the file to me at moi@moi3d.com so I can test with it?

One problem that I just fixed now is that it was trying to process hidden curves instead of skipping them.

Also I've updated it so that it only tries to intersect curves that are on the same plane as the swipe, that should help with performance.

Thanks, - Michael