I'm working on a 24P show and we've been using the XDCam proxy files for our offline editing. This season, however, we've added more cameras, and the multigroups lag when using the proxy MPEG-4 codec. To solve this, we're transcoding everything to 8:1m. So much for faster than real time capture. But I digress. In order to make the transcode happen, you have to change your project format to 23.976 NTSC or else the 8:1m codec won't even be made available to you. Which is horseshit, but I digress. After transcoding, I figured hey - there's no reason I can't make my timelines and groups in the standard def project, right? Wrong. There's a very good reason why I can't do those things, and it's that Avid is a piece of fucking garbage. For a reason I cannot fathom, autosequences created in 23.976 NTSC projects don't match clip TC to sequence TC. They just don't.
Change back to 1080P/23.976 and autosequencing works perfectly with the exact same clips in the exact same bins.
Stupid goddamn Avid.