Pardon the critical bug and the delay. We’d like to provide early/exclusive access to our upcoming version 5 release so that you can immediately work with a smarter playback engine (this issue was of course resolved completely).
This is an outline covering what to expect, and has a signup at the bottom if you're interested. Note that everything summarized is already available in our latest preview app. Additionally, SP5 has been more stable on average than earlier releases. It's the least we could offer, and the opportunity window will remain open between now and next month.