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Closing due to lack of input.
Please reply if you have more information about the issue.
Taskbar Inspector always opens near your cursor, I think that's most convenient.
Why would you want TI to appear at the top when you click at the bottom?
7TT doesn't make permanent changes to the system, so if you disabled autorun, restarted, and the issue still wasn't solved, it means 7TT is not guilty here.
Uninstalling it won't change much.

I'm pretty sure it's not 7TT's fault, but the best way to make sure is to close the tweaker and restart Excel.

That said, Excel was reported to have some other issues with regard to the taskbar, e.g.:

http://rammichael.com/7-taskbar-tweaker/comment-page-11#comment-2312

Are thumbnails displayed when 7+ Taskbar Tweaker is not running?
I guess not.

I can think of a couple of reasons for the issue:
* You're using a basic theme, which doesn't support thumbnails.
* You have thumbnails disabled through a registry option.
http://www.sevenforums.com/tutorials/75804-taskbar-list-thumbnail-previews-mode-change.html

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