After updating to TikiWiki 21.5, the file gallery can no longer be used to embed an image (choose or upload images button) into a page.
The browser window opens and a blue progress bar is visible but then stops.
After some time the following error message appears:
The problem also occurs with a newly created empty TikiWiki with activated elFinder in the wizard.
This cannot be reproduced in the demo system on tiki.org, as the version is still running on 21.3.
Does anyone have an idea how to solve the problem?