My mistake. The DB_TREE bit was a typo. In trying to make the sample case boil down to the simplest version, I goofed on cut and paste. I have $DB_BTREE after all.

I am trying to reproduce the "__foo.db" bit but so far I am not able. This is the reason I asked here. If I was able to reproduce it and just remove the "__" file, I would be okay with that.

The logs files do exist and other information is being placed in them.

Thanks anyway.