I have set up a custom meta (a drop down list / Select menu) and made it required.
Everything worked fine but suddenly validation stopped working properly. The submit button became unclickable in both Chrome and Opera.
When I chech the developer console (F12) I get the following error :
An invalid form control with name='xxxxx' is not focusable.
I have tried different solutions but it seems that the only one working is to add a novalidate to the register form tag. However, that cannot be considered a solution since I want the select menu to be required and validated.