Counter field for Cbsubs

Everything is up to date and even with debug on there is no errors shown.
It simply brings me back to the backend home page.
I have not problems with other fields though.
Is there any other way to change it with the DB ?

It simply brings me back to the backend home page.

I've no idea then. I've retested 4 more times and still works fine here. I've checked changing single select and multi select to query select both with and without options already saved and still works fine. Maybe you're hitting POST input limits due to too many option values? Does doing a normal field save without changing its type also do this (e.g. try changing the description).

Is there any other way to change it with the DB ?

You can change its type directly in _comprofiler_fields, but I don't really recommend doing so.

Well this was the php_value max_input_vars problem which exceeded 1000 !

Thanks for the hint with the post mention

Yeah each option is like 3 inputs. If you were using a country or province/state like usage you probably had quite a few options causing a very high input limit. Using a Query Select will certainly avoid this in the future since it'll pull its dropdown options from a custom SQL query.