I believe the administrator needs to have the highest version.
You've got Transition Mode selected in Compatibility I assume? If not, give that a shot but I think that is intended for the administrator to use if they have a newer version, not one of the users.
Thanks for replying. I'll have to speak to the software team about an upgrade, but that doesn't stop other folk from downloading the new version.
And there was me thinking I'd looked through every menu. Where do I find the Compatibility command?
You'll find it in Edit>Administer websites>your website>Compatibility.
Personally, I'd tell your people not to do that and if they do, yank their admin permissions so they can't install anything.