It seems that the new version (8.1) of Media Encoder strips the 608 captioning off when rendering MXF OP1A. This doesn't happen on all exports. The only commonality I can find is that it seems to happen only on HD source material with embedded 608/708 captioning. The last 7.0 versions worked fine. Renders are fine when done directly from the timeline, but I need to be able to batch process through ME. Any suggestions? Adobe phone support was of little help and simply said that 3rd party captioning was not supported.