Yes, jailbroken and not had this problem until iTunes got updated. And, as I say, it's happening to a number of other people too.

I've also just updated an app (Activator) on the phone, so I've written to the dev in case he hears other reports from people with a similar issue. At least I can still charge it, and I can back it up over wifi using an app.
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If it's brokenless, don't suffix it...