A slight correction for any of you trying to reproduce this at home :-)
I only pretended to change over to filestorage (dream, nightmare, who knows), in reality, I was still using tempstorage.
The same thing happened yesterday and re-starting Zope seemed to get things working again. After the problem yesterday, I changed my temp database to use filestorage to see if that would help. No luck, the problem showed up again today.
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