Hmm... The last edit is gone from my post is seems. I must have cleared it accidentally while closing the browser.
CodeTools has encountered an unbalanced begin/end block somewhere in your code before the apparent error (probably a missing "end").
It will refuse to rename (or do anything else) until that begin/end syntax error is corrected.
Oh, that explains my empirical findings that I explained (now in binary heaven) in my edit.
Indeed I did jump from middle of writing a new CASE clouse to rename that edit8 box, and I did go heywire with the errormessage as it did point to that procedure.

A bit later I tried to run the project to just to see if it would give more information and it did throw me at the point where I jumped to edit the edit8 boxs name.

I then put my WIP Case block inside of the block comments and everything returned to normal.
