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When renaming an existing user to a good, free target username, I will sometimes get neither error nor success message (and returned to a now-blanked form on the Special:Renameuser page, as expected).  This inevitably means the process has failed, and should be tried again.  I have not figured out what circumstances make this happen; just tried it 10 minutes ago for two different users and was successful twice out of 8 attempts.

This may just be general db unhappiness at the moment; I'm also having trouble getting edits to save.  But an extra catch that returns an error unless there is a success message would be useful.

No new comments/known issues since 20 months. 

Closing this bug as WORKSFORME.