Are you, by chance, from one of the following countries?

China, Japan, Hong Kong, Korea, Thailand or Taiwan.

The hosting had some issues with these in the past.

Should not be necessary now, when there's the Advanced Options Editor.

See here for more details:

http://rammichael.com/7-taskbar-tweaker-v4-4

Done in v4.4.

Done in v4.4.

This is possible to do with registry options.

See help file for more details.

I don't plan to add it to the GUI as I believe it's not too important.

A duplicate of http://tweaker.userecho.com/topic/166684-a-group-cant-be-closed-by-middle-click/ ?

OK. Next thing, open Taskbar Inspector and check the "Group pinned items" for the problematic programs:

http://i.snag.gy/G3hON.jpg