I am using J3.9.1, JCE 2.6.33 Pro and Helix Ultimate 1.0
In frontend editing I cannot open the JCE File Browser. I get an error 404.
I have activated the option "JCE File Browser in Image Fields". Clicking on any media type field or custom field type mediajce produces an error 404 in the popup.
There is already a quite long blog post in Joomshaper forum:
Do you have an idea? How to solve that?