I was in my Google+ refugees group yesterday, checking to see if that mass spammer spammed my group. I go back in today and NOW I see 6 messages awaiting moderation... going back to MAY (including one from that spammer). There was no notice yesterday of any waiting.
To add insult to injury, after I reviewed all 6, it now says there are 2 awaiting moderation, but when I click the notice, there are none. No amount of refreshes changes this.