Property editor seems to be broken.
Yes, absolutely losing our minds at our agency today. Cannot make any edits to visual elements, and then the tab gets stuck in conditionals.
Thanks for reporting. Team is on it now and I’ll update here when a fix is live.
Thank you for such a quick reply! We have a big all-hands dev day today and this has been slowing us down a lot. Trying to make big progress so this will be amazing to get it fixed. Thank you!!
Probably because of the newly shipped conditionals to change the styles. Thanks for responding!
Experiencing this issue currently too
Yes… 
Yep, looks to happen when you remove a condition and try to swap between elements. Need to refresh to fix.
If you switch to the new editor the issue isnt there…but there are a bunch of other issues so pick your poison 
Yeah, I have just been using the new property editor. So I don’t see those issues. 
Should be fixed now. Really sorry about the inconvenience!