i am using Plone 5.0.4 and when i create a new site with english language it is no problem. But when i create a site, at least in german, i am not able to select an image to insert it with the TinyMCE Editor. I am able to browse the directories and i see the image files, but when i click on it the image could not taken. Switching to english in the language settings solves this behavior.
I think this is solved already. There are several the same or similar issues in the tracker that have been closed.
For example this one: https://github.com/plone/plone.app.content/issues/77
It might be solved with plone.app.content 3.1.1. So you can try to update this single package in your buildout, or wait until Plone 5.0.5 is out, which should be 'soonish'.
I try to update to plone.app.content = 3.1.1 and for a new created site it works fine
But on the existing site i cant display the content-tab anymore after the update and got this error
Traceback (innermost last):
Module ZPublisher.Publish, line 138, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 48, in call_object
Module plone.app.content.browser.contents, line 275, in __call__
Module plone.app.content.browser.contents, line 233, in get_options
Module plone.app.content.browser.contents, line 65, in get_top_site_from_url
Module ZPublisher.HTTPRequest, line 280, in physicalPathFromURL
ValueError: Url does not match virtual hosting context
Switching back to plone.app.content = 3.0.20 solve the problem on this site...
I estimate this happend because i switched the language several times from en to de ... or something like that
I will try to find some more information or logs on an other testing instance of Plone 5
Maybe the next minor update to 5.0.5 will fix it ...