Default Friendly URL Provider broken in DNN 7.1.1

Feb 6 at 9:27 AM
Well, here is a really strange case:

A very important client of mine recently had an issue with the site, where the default friendly url provider was broken. The only page that could be loaded was the homepage and all other pages resulted in a blank page with absolutely no response (blank view source).

Since we haven't found the cause of the issue, we installed iFinity Friendly URL Provider and replaced the default rewrite provider. That almost fixed the problem but there are still some pages that won't load (example) and the 404 page won't work.

I wonder if installing the DnnUrlManagement would fix the problem. In other words, can this module be used as a defaulr url management repair?

Any ideas or suggestions would be really appreciated. Thanks in advance.