Upgraded Tortoise to 1.50 but still won't ask for credentials on commit after it fails with saved authentication

I upgraded Tortoise from 1.4.8 to 1.5.0 but it had no effect on this
problem:

I do an update, using a read-only account and check "save
authentication". It does the update. I can view logs, do diffs etc.
When I commit, I expect it to fail because the account is read only, and
to ask me for credentials to do the commit. But it just gives an error
and gives up (see below)

Command: Commit
Error: Commit failed (details follow):
Error: Server sent unexpected return value (403 Forbidden) in response
to MKACTIVITY
Error: request for
'/svn/hksk/!svn/act/6c3af0bd-8c47-2b43-90a9-e319737a042a'
Finished!:

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Received on 2008-06-24 21:01:57 CEST