No problem, per se, however it would be nice if PM notifications included the message in the e-mail. Invision does this, and it's useful for screening notifications.
What I would REALLY like to see is the ability to subscribe to a thread without getting e-mail notifications. I'd like to be able to go to the control panel and see all the subscribed threads but not get my mailbox spammed. I don't know what this option has never been written for any board I've seen to date.
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Revisionist Far-sighted historian.