Thanks, StefanK, I will try backing it up and sending it to you when I have a chance.
For now, though, it happens with most of my feeds, not all. Currently, 4 are unaffected, but 18 are having the resume download problem.
It seems to only affect older episodes that have been downloaded for awhile. However, as drt said above, it seems like things that downloaded fine one day will be showing "resume download" the next. I am not sure when the change occurs, maybe during my nightly update of all feeds?