It was reported long time ago. I don't remember what was the issue.
We have a default nopCommerce 4.00 installation and we installed the latest version of Nop Ajax Filters Pro.
We found that if we use the price range filter, the page stuck in that state, what I attached.
As you can see, in the example, I lowered the maximum price, I and got that screen.
The browser working, likes to finish something, but this takes forever.
Can anyone help us?