Hi
I do have the same error after migrating from v5 to v6. I created the folder /templates by hand but it remains empty, nothing happens there. Afterwards I tried to perform the migration again from v5 to v6 (just the templates) and I got the same notifications again.
Ignoring the notifications? May be, but I do have a problem inserting images in templates made with the Acyba Editor: I can apply the insertion but after pressing the Save and Exit button, the website hangs for a couple of minutes. When the timeout is over, the image is actually not saved. Even more: when I re-open the template Acyba tells me that it found changes and asks ne to recover them. Recovering succeeds but saving the image keeps failing.