Quote:

I MUST have tweaked a setting somewhere, but I'll be darned if I can figure it out.




Well, let's apply some logic here. Settings are not sitting there to be randomly tweaked by accident. Most of the things you can "tweak" are three drill levels down, so you did not likely accidentally tweak anything that had to do with timing or tempo. You may want to try a quantize (AFTER you make a copy and play with the copy and not the original file) or record the track again and see if it stays in time this time through it.