[DerekM]

This shouldn't have anything to do with the file size. You are unable to find the 1417 line on the Mac in any version of the file? If that's the case then your files would appear to be out of sync and that is an issue we would very much like more info on.

Conflict copies will be created any time OmniPresence believes it is in a conflicting situation. The "...filename can'be be autosaved because the file was changed by another app" error can certainly result in this. I'm not sure I have a good explanation for it as I occasionally run into it in various apps for unknown reasons. If you are able to cause this frequently, it would be good to know how.

When a conflict is found, it is best to check as soon as possible which version of the file you want to keep and move and missing data from the other version to it. And then make sure both devices are editing the right file.