MATLAB Version: 9.7.0.1247435 (R2019b) hangs and does not boot

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Hideki Kawahara
Hideki Kawahara on 7 Jan 2020
Commented: Eric Busvelle on 27 Jan 2020
Suddenly, MATLAB Version: 9.7.0.1247435 (R2019b) Update 3 hanged on usual startup by clicking. I re-installed MATLAB R2019b. But, it did not work.
It starts from termonal using the following command.
The following is the copy of the terminal display:
kawahara@MacBook-Pro-4 /Applications % /Applications/MATLAB_R2019b.app/bin/matlab -nodesktop
< M A T L A B (R) >
Copyright 1984-2019 The MathWorks, Inc.
R2019b Update 2 (9.7.0.1247435) 64-bit (maci64)
November 7, 2019
To get started, type doc.
For product information, visit www.mathworks.com.
>> ver
-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.7.0.1247435 (R2019b) Update 2
MATLAB License Number: 261874
Operating System: Mac OS X Version: 10.15.2 Build: 19C57
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
MATLAB Version 9.7 (R2019b)
Audio Toolbox Version 2.1 (R2019b)
DSP System Toolbox Version 9.9 (R2019b)
MATLAB Compiler Version 7.1 (R2019b)
Signal Processing Toolbox Version 8.3 (R2019b)
>> exit

Answers (1)

Hideki Kawahara
Hideki Kawahara on 7 Jan 2020
Finally, it was fixed.
I started MATLAB with nodesktop option.
/Applications/MATLAB_R2019b.app/bin/matlab -nodesktop
Then, started desktop from the command line.
It opened the usual desktop.
Then, exit using the menu-bar.
Next time, I was able to start MATLAB by clicking the MATLAB icon.

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