Spinner in backend won't stop spinnging after update, probably new issue in v. 3.0.200

[joe_g]

Hi there, I've got a peculiar problem in the backend I don't manage to solve on my own. After moving a page, the spinner won't stop spinning:

Under Network, in the console I can see continuous requests:

Not sure how to fix this one. I run over 10 other PW install on the same server, they all work fine. But this one is the only one with the latest version ProcessWire 3.0.200. So I assume it has to do with something recently changed.

thanks!

 

[dotnetic]

Any javascript errors in the Dev Tools console? Install Tracy Debugger and see if errors occur there