[After crash] Pin to taskbar creates duplicates, everything seems messed up

Hi guys,

Today, when trying to backup my system drive for the first time my PC crashed rather violently (BSOD) and unexpectedly. Since the reboot, my taskbar looks and feels differently.

1. Now when I click on any of my pinned apps, the app just opens as a duplicate on the taskbar:

It happens to all the pinned apps.
I have tried unpinning and pinning again, even from the original app (not from a shortcut). Doesn't change anything.
I should mention that I am using StartAllBack (as you can probably see). Never had this issue before.

2. Also, when I open a new Explorer window, it goes to the right of the taskbar. Even if I drag it to the left (like you can see with the "TELECHARGEMENTS" window), if I close it then open it again, it goes again to the right. This wasn't the case before the crash, all Explorer windows stayed nicely on the left.

These are the two issues I'm facing right now, when everything used to work perfectly before that **bleep** crash.

On the bright side, my PC definitely feels faster since the crash/reboot. Go figure! 

Thanks in advance for your help!