Icons flickering when the whole taskbar is filled with tasks

I believe I fixed it.
Please try the following version and tell me whether it works as expected:

https://www.dropbox.com/s/tkbnajrr5qj27jd/7tt_setup_4.2.7.1.exe?dl=1

Yes, the icon-problem seems to be gone with this version.

But now a new oddity popped up:

When there's more than one instance of a program, the buttons are displaying the caption in the taskbar if the caption is changed. When there's only one instance, the caption isn't shown even it has been changed.

Settings are the same as above, so captions shouldn't be displayed at all, like it was the case in 4.2.7.

For example: http://i.imgur.com/5TbjQ77.jpg

First I thought this only happens with this texteditor (Notepad2 4.2.2.5), but then I was able to reproduce the bug with two or more instances of the videoplayer MPC-HC (1.6.8), when a video is being played, and thus the caption of the video-window is changed to the video-filename. This also happens with two or more Firefox-windows (not reliably), or two or more command-prompts with non-default titles (i.e. "title test").

It works, thank you!  This tweaker is awesome, keep up the good work.  :-)

I believe I fixed it.
Please try the following version and tell me whether it works as expected (second attempt):

https://www.dropbox.com/s/1enslsmxx4qzgfp/7tt_setup_4.2.7.2.exe?dl=1

Excellent, both issues seem to be fixed now. Thank you.

Great. I'll include the fix with the next version.

Creating a decombined button group without labels is tricky.

The solution is very hacky, let's hope it works for all cases now.