Hi Jon,
I'm pulling 16.2 with the current build. We're not using a custom version for this, all the custom work is contained in modules and LabKey is built from source each release. After commenting out the throw exception line and writing some logging, it appears to be failing on the "kiem" module, at least so far. Due to replication issues it's difficult to force it to fail more rapidly for faster troubleshooting. I saw this thread, https://www.labkey.org/home/Support/Developer%20Forum/announcements-thread.view?rowId=14085, and verified our build process is clean --> production.

Attachment is failing. Is there another way to get you the log?