Ok - a bit difficult to find - but leave it to a customer to discover it.
If you are using the editor on a Mac - and you flip to code view (setting it to FullScreen mode) - the editor will not function. What I mean by not function - is the caret will disappear, the arrow keys will move the scroll bars (if present) - but not move the caret location. Deleting will stop functioning as well. When you move a selected region - it will copy and not move. Select a region - and the editor will not delete.. and errors occur when trying to use the cut command.
This is vital for my Mac customers (always seem to be the loudest complainers) - since they use the editor to edit HTML in my system.
regards,
Dave