Martin, Tobias, Thanks for the info. I'm glad you confirmed there was no "secret" method of emptying the hashtable that I'd missed. Also that my suspicions about invalidating the enumerator if I enumerated-and-removed were correct.
In the end (a Friday afternoon deadline approaching) I decided to simply free all of the memory consumed by the elements in the hashtable followed by deleting the hashtable and creating a new one. I would only do this once, on startup, if a particular sort of error occurred. Not too expensive. If I get a chance, I'll try out your patch, this may take some weeks to getting around to though. Cheers, Graham.
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