I have taken a look at this and am not seeing the problem here any different than without S11 though the link above does not work and no download happens so I manually did the ExtendedUIHoverTime tweak.
I was able to make it show previews and get stuck on screen without Start11 running.
This can be reproduced by doing the following.
1) Have multiple windows open for a given process (say explorer).
2) Click on the taskbar button for the app. The thumbnails will appear
3) Once open clicking on anything other than the thumbnail preview will not make it go away.
4) If you click on one of the windows and then move your mouse back over the taskbar button you will find it will popup the previews but only on that one taskbar button and only once until the next time you do step 2.
Is this perhaps what everyone has been seeing? If not what exactly is the behaviour, is it showing on all apps when it shows, or just the last app you switched to perhaps via the taskbar?
Are you using combine mode taskbar or uncombined and if combined does it continue if you enable uncombined and then disable showing the text.
Start11 does not implement this window or the mouseover behaviour, Neither can it control how it appears so it cannot alter if it shows as a line of thumbnails or a menu/list.