Hi,
The only place where renaming is allowed is in the 'active file list', which is the lower right part of the main TF window (the one with all the stats).
Oops, you are right, the other places allow it. Shoot, thanks for pointing that out.
When you actually rename the file using the active list TF will pop up a window confirming the rename.
I'll change it so the 'file picker' window doesn't allow a rename that doesn't work.
Thanks.