Hi Nailer - depends which issue your sub started with; although there was an August issue, that would have been on sale in the US around June so I'm not sure they'd have sent you that one for an August start date.
So, there's October and November. I had been working on the basis that my copies (surface mail only) arrive in the month of the publication date (ie, I get my October issue in October, although US readers get it around two months before that, and UK airmail subscribers somewhere in between). However, my October issue didn't turn up until yesterday :roll:.
It's a great magazine (great website, too) but their subs service is the worst I've ever come across.
Anyway, I'd certainly e-mail them and ask where your October issue is. On past performance they'll apologise, extend your subscription by a couple of months, and then your 'missing' copy will turn up a few weeks down the line.