Apologies for being so late with this known error.
V2.27p5 etc
When Check Entry, the routine always stops at the first PT Boat spawn. The only work-around is to delete all the PT spawns from the oba file, run Check Entry, and then reinstall them after all the other entry points check as good. In v2.26 I was still able to upload the terrain even though it stopped at the first boat entry.