I’ve found the answer to my own question. Here’s info here for anyone else who hits this bump.
The exported projected having clips trimmed in the wrong place seems to happen when you have Media Encoder and Premiere sharing the same cache folder. This also explains why, after a bad export experience, the PP project can end up with the project itself full of retrimmed clips on your time line.
So, you need to change where Media Encoder is stashing its cache.
Fire it up separately. Go to
EDIT > PREFERENCES > MEDIA
Change the location of the cache folder.
I also found some other ways around this problem by exporting from PP using Encore and then using a conversion program like “Super” to give me the end Codec I wanted. In which case, these steps worked:
Finish PP Project
Clear PP cache
EDIT > PRFERENCES > MEDIA … Clean cache
Do a final render
Make sure your sequence is up in the top left hand window.
Highlight your time line workspace.
FILE > ADOBE DYNAMIC LINK > Send to ENCORE
After Enore launches, in Encore:
FILE > BUILD > FOLDER
Brings up your Build Box
OUTPUT to DVD Folder
Browse to where you want to save your material.
Click BUILD
You’ll end up with a VOB file in the folder you named.