You can typically find the exact reason for the fix by checking the included with the release, which often notes what was wrong with the previous "nuked" version.
: Corrupted frames, stuttering, or aspect ratio errors. Watch Halo S01E01 720p WEB h264-KOGi 1
: A fix released by a different group than the one that made the original flawed release. You can typically find the exact reason for
: Using the wrong codec or failing to meet specific bitrate standards. Watch Halo S01E01 720p WEB h264-KOGi 1
: Used in rare cases where a previous "PROPER" release was also found to be flawed and required its own correction. Why Releases Get "Propered"
: A fix released by the same group to correct their own mistake.
Common reasons for a release to be superseded by a PROPER include: