All databases were ok except the plugins database. But this is maybe not related to the pms.
CB plugin "CB Activity" database structure differences:
Table #__comprofiler_plugin_activity_themes Rows id = 4 do not exist
Table #__comprofiler_plugin_activity_themes Rows id = 5 do not exist
Table #__comprofiler_plugin_activity_themes Rows id = 6 do not exist
Table #__comprofiler_plugin_activity_themes Rows id = 7 do not exist
Table #__comprofiler_plugin_activity_themes Rows id = 8 do not exist
But it looks like all these messages are my welcome messages from the Auto welcome plugin. Maybe the problem has something to do with this plugin? Also, most users maybe do not notice this issue. If I had not activated this special feature in admin tools I would not have known either