I have been unable to get GTM working for a few weeks (as outlined two threads ago). Version 1.7.2 doesn't work for me.
On one occasion, I deactivated the plugin, deleted the files and also deleted the GTM tables in the database. I understand this may have been a bit drasti, but I have been desperate in trying to get this plugin working.
I notice that installing and/or upgrading plugin does not create the GTM tables.
I have also checked the database permissions and granted the database users maximum permissions.
Is there some sort of flag somewhere that makes GTM think the database tables have already been created.