I'm using PPro CS 6. I've exported my 90 minute film as a DPX sequence. This image sequence is effectively my master. I then export this DPX sequence as a MPEG2-DVD and I get the following artifacts on random frames. It happens whether I'm exporting PAL (non interlaced) or NTSC (interlaced). I've now run the encoder three separate times and I get random artifacts on completely different frames. I'm checked the DPX images and they are fine so I know this problem is happening in the encoding.
It exports fine from the original edit which uses MXF and Red One R3D files. However, I'd prefer to have a single master sequence for future archiving, etc. Clearly there is a bug in exporting MPEG2-DVD's from a DPX sequence.
Render out the DPX sequence and then choose Import, select the first image, then click on the Image Sequence check box. I've found that the DPX sequence has to be at least 40 minutes long since short sequences don't seem to be a problem.