It's not a bug, it's a feature ;)

I guess you (accidentally?) chose to never show labels for AIM's AppID.

Open Taskbar Inspector and right click on AIM's AppID.

Screenshot:

http://rammichael.com/wp-content/uploads/2009/09/Taskbar-Inspector.png

Not a bug, moving to "Ideas".

Works fine for me on Windows 8 64-bit.

I can't do much based on this error message.

If you want to get this solved, contact me via email and I'll give you a test build, so we can see what is the reason of the failure.

http://rammichael.com/7-taskbar-tweaker/comment-page-12#comment-2504

Couldn't reproduce on Windows 7 32-bit:

http://i.imgur.com/4e48fdC.png

It's not dead. The website is temporary down, I'm trying to sort it out.

About the suggested feature, currently it's not planned.