Social.ReportProgress invokes callback twice

Hi all,

search turned up no answers or leads to t$$anonymous$$s problem I'm observing, so I hope t$$anonymous$$s is not a duplicate. I'm having an issue where Social.ReportProgress is invoking its callback once during the initial call (correct behaviour), and then invoking it twice for every subsequent call (unexpected behaviour). I was careful to call Social.ReportProgress once only each time. I've built from both Unity versions 4.5.5 and 4.6.3. Circumstances are Does anyone have any ideas on why t$$anonymous$$s might be happening?

I am using an iPhone 6 plus with iOS 8.0.2, if it matters.

Thanks! Jay