Just press Esc a couple of times (Sometimes it takes more
than a couple !),and rename the control.

that of course works if the problem is that it won't let
you create the ambiguous name.

but this morning, it let met creat the ambiguous name,
save the file, etc...

the question was if there was a way to recover AFTER the
ambiguous name was already created.

but, for now, it's unimportant. I have the other copy.