Hey,

an user wanted to add view-restrictions on a page and pressed "Save". The grey circle turned around and turned around. Nothing happened for minutes.
Then he closed the dialogue and pressed F5 > the restrictions was set.

A small investigation shows that the set restriction request needed more then 10sec to execute on server (there are a lot of restrictions set on the page) and the browser get a timeout. The user did not get informed and so he waits and waits..

Please add an information if the request timed out.