Ordinarily, (if you have them set to pop up in the bottom left corner), the notifications pop up just above the Start menu. However, if a notification is popping up as I am returning from screensaver, it appears in front of the Start menu. When the notification disappears, a transparent version of it remains overlayed with the Start menu. (Hopefully that makes sense, but if it doesn't, don't worry -- I will post a screenshot next time it happens you can see what I mean.)
I should offer the disclaimer that I am using a WindowBlinds? theme, so it is quite possible that it is not a Guifications bug itself, but that, or even something else. (For example, I have the Guifications 'active' setting set to 'no'; I haven't tried it with active on.) So if anyone else has noticed this, please reply with your experiences.
Like I said, I will post a screenshot the next time it happens.
