I would suggest NOT upgrading to the latest cPanel release. I upgraded one of our boxes yesterday and today saw SEVERAL defunct processes and about 80% of swap being taken up (memory leak anyone?). I then rolled back to stable and the box was back to normal. Just an FYI for everyone.
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What exactly was / is the problem ? Did you submit a bug report ? What processes were at play here ? Though i've not got any bsd boxes, i've not seen a single issue such as this with any of our linux edge current release or stable boxes.
Sure you may have had a problem, but telling others not to update without providing any further information is pretty much useless and unbelieveable. It'd be very helpfull if you could post more information ( especially your bugzilla report ) as perhaps some of us may be able to lend a hand or give some idea's ?