After the URL for the WYSIWYG button has been changed from ?skin= to ?cover= I can no longer edit in WYSIWYG mode on my SVN installation.
It seems to work on develop. But not on my should-be-up2date-dakar-svn-installation.
If I manually write ?skin= the kupu editor starts like before.
Something went wrong with that change
I can see that might happen if you have EDIT_SKIN set. Do you?
Guessing that you did. Anyway, I removed EDIT_SKIN (it was never a good mechanism) and added in COMPOSER instead, which allows you to switch in a different Wysiwyg editor.