Hi Fabian,
thank you so much for the quick response.
Yes I'm running multisite (need a site per language that my website supports: http://www.tweaking4all.com (English) and http://www.tweaking4all.nl (Dutch) ).
I tried your changes, and the dialog now appears ...
However NONE of my files or categories are listed ...
When I go into the admin pages (WP-Filebase - Files) then I do still see all my files and categories. So it's not like they are lost ... just the editor plugin is not picking them up.
Would you recommend going one or 2 versions back?
And if so: where would I find those?