App crash when running DQNCartpole

[bewithme]

Issue Description

Please describe your issue, along with:

• expected behavior
  run correctly
• encountered behavior
  app crash

Version Information

Please indicate relevant versions, including, if relevant:

• beta7
• Mac OS 10.15.6

hs_err_pid35378.log

Contributing

[saudet]

It looks like it's crashing in the GUI code. Please try to hide the render window. If you need the render window, you'll probably have to run the example from the first thread. It's a typical limitation of Cocoa on Mac.

[bewithme]

how to run the example from the first thread ?

[saudet]

Good question. @wmeddie Have you ever figured out how to do that?