Plex Media Server 0.9.15.3 is now available for everyone.
(Transcoder) Improve performance transcoding video to MP4 containers. (this change didn't actually make it into this release)
(Media Optimizer) Crash after video transcode with certain subtitle configurations.
(Sync)(Windows) Issues ensuring transcode directory is writable.
(Sync)(iOS) Improve accuracy of synced resolution and bitrate metadata.