Hi there
I am experiencing an odd problem with "link to internal page" from the content block. (concrete vers. 5.5.2.1.)
I really do hope that someone out there is able to help me with this.

Suddenly I am no longer able to choose pages in sitemap in "insert link to page".
I do see the sitemap, but I am not able to click on any page.
The only thing I can do in "choose a page" is to fold and unfold the page tree.

Have any of you experienced a similar situation, and did you manage to come up with a solution?

I have checked that this is not theme related, also I did a fresh install of the concrete core and I also updated concrete to the latest, but to no avail

Any hints and feedback are most welcomed