There have been a number of ffmpeg related changes in XBMC (and more to come from the OpenELEC side), I wonder if this could be the reason for payback problems...
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.