I’d say it’s a bad source file. There are a lot of re-encodes of DeEd out there, mostly to reduce the file size. If you verify your checksums for your original download in the DeEd thread, that would rule that problem out. The only other option would be a bad burn, media problem, or something like that. Layer change transitions should be irrelevant in the Blu-ray world. Also don’t try to load up your Blu-ray with too many optional tracks – Blu-ray does have limits, and there are enough audio and subtitle tracks out there that it’s possible to go over them.