app designer stuck right after opening

Hello,

I am using MATLAB R2018a on a linux system and am having quite the problem with launching app designer.

When first I tried to open appdesigner (with simply 'appdesigner' in the command window) I got this messages:

after some online search I asked our system guys to install libXScenSaver. after that I typed 'appdesigner' again in the command window.

No error message, window pops up but the display is stuck on the background

Hope someone can help in solving this.

Thanks.