BYOND Version:479
Operating System:Windows 7 Home Premium 64-bit
Web Browser:Firefox 3.6.13
Applies to:BYOND Pager
Status: Unverified

Thus far we've been unable to verify or reproduce this bug. Or, it has been observed but it cannot be triggered with a reliable test case. You can help us out by editing your report or adding a comment with more information.
This happens over just about everything when a pager notification is displayed PagerStacking.png
It doesn't seem to clear the previous bubble as it slides up the screen or something. It all clears when the notification closes.
Yeah, have same problem too in Windows 7 Ultimate.
I've seen this now and then but I haven't been able to reproduce it on a consistent basis. Usually when I see it though it's because the app behind the bubble isn't repainting properly, which is pretty normal in Windows for those types of situations. Maybe something specific to Windows 7 makes it more likely to happen.

From what I can see though the whole process behind the scenes is doing what it's supposed to be doing, not leaving places where it should have done a clear first or something. I think I'll need to be able to catch this in action on a more reliable basis.
Is there a way to force the bubble to pop-up so I can do some testing?
Falacy, are you using Windows 7 Theme?

I've figured this out, i think.

This happens when you're using the Windows 7 Theme, change it to Windows Classic theme and it should be fixed.

I've tested this.