Can't open blocks, whats the permissions suppose 2 be?

Hi- I am inside my admin “blocks” section and my blocks won’t open for editing after 212 upgrade. They use to open in the past. Is there something I need to do open the other blocks? When I click on the plus sign to open, the thing pops up on the top of my screen saying loading to position, but doesn’t open. I would appreciate any help you could provide.

Kindest Regards

AlmondJJoy :confused: