Appdesigner does not open, shows black window

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I just used appdesigner 2-3 days ago but now it wont open. I cannot reach it using appdesigner command. I cannot even run previously designed apps. All of them launch a black window:
I tried restarting the computer, waiting for black window and rehash.
Only change I did in last days was installing java but java.lang.System.getProperty('java.home') still shows it uses its own java anyway.

Accepted Answer

Caglar on 26 Nov 2018
My graphics card had a hardware problem. Some applications were giving 1114 DLL error due to that, but MATLAB was merely showing black screen. I forced computer to use on board graphic card for MATLAB and problem was fixed.

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