Error after saving Page Designer (Freedom UI, version 8.0)

Hi,

I am experiencing the following problem:

After modifying a field (its name, the source of the lookup, or adding a new field) in the Page Designer I hit the SAVE button, but the page freezes and after a while, I get an error message from the browser saying that the page is not answering, and I can either wait or close the tab. Waiting doesn't help, and every tab I am logged in to the Creatio environment crashes as well. It doesn't work in a different browser either.

This error occurs for some objects but not for every object. I cannot identify any difference between working and non-working objects that could cause this problem.

Any idea what should I check? Did anyone experience this phenomenon?