Song is playing fine here also as I type this.

So my guess is that it is not a corrupted songfile.

You might check the two realtracks involved on your hard drive, see if they play from end to end using a media player, for one thing.

Song has finished playing here, all the way to the end. And since you must have had the Loop checked when you saved, it started over from the beginning again. At bar 22 now.

A real head scratcher, try rebooting your computer and check it again. Maybe...