I've had problems in the last few months as well. My problems had more to do with missing issues, rather than late arriving issues.

My copies almost always arrive around the middle of the preceding month. The October 2007 issue went missing, and was replaced promptly after a phone call to the number listed in the front of the magazine. I blame the post office rather than Stereophile.

Are you a new subscriber? The July issue may have been sent automatically with the entire subscriber base, while the June issue may have been sent manually, so to speak. I wouldn't worry about it unless it becomes a pattern. And welcome to the forums!