Unfortunately I have seen an old bug appear again.
When I open up the dataprovider editor the list op tables doesn’t show but says ‘loading…’.
I am able to edit the dataproviders but only those of the table of the currently showing form.
Are you sure all your servers are setup properly? (if the driver fails to connect you can have a time out up to 2 minutes)
I am pretty sure. It is my localhost. This doesn’t occur all the time but very often!!!