Hi all,
I had an apt upgrade fail to run the database update script part so the zoneminder services stopped and wouldn't restart. I finally figured out i had to update ZM_DYN_CURR_VERSION and ZM_DYN_DB_VERSION in the Config table of the database (from 1.34.0 to 1.34.6). The updates from .0 to .4 hadn't cared. Anyway, then the services started ok.
Just an FYI in case anyone has this problem and can't figure it out.
Thanks ZM team for a great system!