MATLAB app designer close during running

Hi all,

I'm using MATLAB 2019b to run an app in App designer. However, this bizzare phenomenon occurs when I call another app: the screen turns black and MATLAB close itself. Is there anyone know what reasons may cause this problem?

Thank you a lot!

[Qing Li]

MATLAB closes itself every time I call another App. This has not happened before in MATLAB 2019b. Recently I upgraded to MATLAB 2020a but find it extremely slow, so I unload 2020 and install 2019 again. But when I start to run my previous written apps, this keep happening.

Answer 1

[Adam Danz]

Open the problematic app in appdesigner using r2019b (or whichever release you plan on using). When an app is developed in one release and opened in another relase, AppDesigner converts any inconsistencies caused by the change in relase. At that moment you are provided a link that allows you to see what changed. Often times nothing changed but some times you might lose a feature that was supported by the more recent release. This conversion only happens the first time it is opened in a different release. So if you still have a backup from the r2020a version, make a copy of it for safe keeping and open it in r2019b to see if any there are any problems.

If that doesn't point to a solution, share your crash report with the MathWorks support staff. Just be sure to make copies of the affected files before doing anyting.