Besides the confusion about being in the right Circles, some Google+ comments can be overlooked, because of the comment view selector. We see odd problem reports, in Blogger Help Forum: Get Help with an Issue . When a friend mentioned she'd commented, I found that odd - because I couldn't find the comment anymore. It had shown up previously - but it was now gone. The view selector is not so obvious, either. It's similar to the "Compose" / "HTML" buttons , in Post Editor.
What Blogger won't tell you