To reset your panel, open a terminal with Ctrl + Alt + t and type the following command and it should reset your panel!:
mate-panel --reset
If the above command doesn't work, try:
sudo mate-panel --reset
Log out and back in after running the command!.
To show minimized windows, add a window list, right click the panel > Add to panel > select "Window List" > Add > Done!.
To log out without a panel button, press Ctrl + Alt + Del and then logout. 