I fell victim to the File-Final.puz vs File-v2.puz problem... IE: I uploaded the one where I hadn't fixed all the clues after removing some cheater squares.
15 down's answer used to be MER (clued as "Eau full of 64A64AAbundant in le mer[---]"), but there is no 15D anymore.
Thanks for pointing that out! Totally missed it!