unable to add database for clients that have custom template and no DB server selected
This is the error I get when trying to add a database.
The error occurs for clients that have no DB server enabled in custom template.
The problem is that there is no error description so there is no hint what to fix. The issue occurs only for clients that had 'custom' as the master template selected before the upgrade and where the custom template had no DB server selected.
I did a bit of testing. This is not the case for clients that were created after an upgrade to 3.1 and does not even apply to clients that have the DB server unchecked manually after the upgrade.