Can not log my position since 3.3
i don't find solution ...
I would try to back the original traccar.xml with the H2 Database. If it does not work the problem does not come from you config file. If it works chnage the databe to mysql
https://www.traccar.org/mysql/
If it does not work, I would investigate on the Unique identifier.
Here the solution ;-)
https://github.com/vitalidze/traccar-web/issues/510#issuecomment-182235445
and my traccar android client say me " update successful" ..