I have updated Tiki from 17.1 to 20.1 and installed the new diagram-plugin.
When I choose to store the diagram in a file gallery, the first edit and first save works well.
However, the second edit cannot be saved, then I get the message within the diagram editor:
An error occured, please try again.
I guess that there is a problem with permissions, but this also happens if I am logged in as admin.
Does anybody has an idea how to solve this?
Many thanks in advance!