[ubuntu_mate] Mate 15.10 breaked after unchecking Enable indicators (Mate Tweak/interfaces)

Hi all,

First of all, I am still quite new with Linux and Ubuntu. After using other distros, last week I’ve installed Ubuntu Mate 15.10 dual booted with Windows 10.

Today I was trying different panel layouts in Mate Tweak/Interfaces/Panels. Basically last days I was using the Netbook layout. But after changing to cupertino and unchecking indicators the whole system did break. Afterwards I still could move the courser, but not click or open any icons, apps or windows. Shortkeys like Ctrl+Alt+T, Super (the windows key), etc...do not work neither. Right now I am not able to open the terminal or click power off. So I only can press the power key manually to suspend the system and later I can shut down.

Not sure what exactly happenend, but I hope there is still a solution to repair the system.

Looking forward for some help or Idea.

Thanks in advance