I probably catch the rare bug related to option "Taskbar items / Pinned items / Remove extra gap between items" does not working on my Windows 7 x64 Ultimate, but I remeber that at some older version(s) 7TT working properly. Now nothing is changed.
I would be possible I preffer more flexible option "pinned buttons padding" or "gap size in pixels".
P.S.
Is possible that this option does not work after some update (.dll changed an a hijacking is not succesful now?)