This tends to happen more frequently when provisioning to our larger VMWare clusters.

After selecting the VMWare CR to deploy to on the 'Host' tab of 'New Hosts,' if you don't wait 1+ minute sometimes, when the user selects the 'Interfaces' tab, it becomes 'greyed' out which renders the screen useless since it puts the buttons in the background and won't allow the user to click anything. The only option at this point is to reload the entire page forcing the user to start over.

I have attached an image of when the screen becomes greyed out. I do not know if this is specific to VMWare or not since that is the only CR that we use.