I don't completely understand which kind of drag'n'drop you are talking about. Can you provide a screenshot?

Also, what's your Windows version, and 7TT version?

Perhaps it's a Classic Shell issue. I'll look at it when I have the time.

Probably a duplicate of:

http://tweaker.userecho.com/topic/1026674-7-taskbar-tweaker-not-working-properly-after-latest-nov-2015-windows-10-major-update/

Please try the latest beta version of 7+ Taskbar Tweaker.

Build 10586 is not supported at this time. Closing as a duplicate of:

http://tweaker.userecho.com/topic/1026674-7-taskbar-tweaker-not-working-properly-after-latest-nov-2015-windows-10-major-update/

Currently this build is not supported.

http://tweaker.userecho.com/topic/1026674-7-taskbar-tweaker-not-working-properly-after-latest-nov-2015-windows-10-major-update/

Closing as a duplicate of:

http://tweaker.userecho.com/topic/1026674-7-taskbar-tweaker-not-working-properly-after-latest-nov-2015-windows-10-major-update/

Have you installed the latest Windows 10 update?

You can check by running winver from the start menu: if the build is larger than 10240, then you're using the new version, and it's not supported yet.

http://tweaker.userecho.com/topic/1026674-7-taskbar-tweaker-not-working-properly-after-latest-nov-2015-windows-10-major-update/

The new update of Windows 10 is indeed not supported at this point.

http://rammichael.com/7-taskbar-tweaker-windows-10-the-first-major-update

That's actually possible with the option "Ctrl+Win+Tab (Windows 7)". I'll rename it in the next version to make it clearer.

At this time, Windows 10 builds newer than build 10240 are not supported.