What do you think should have happened: selected image, selected sd card, clicked flash but nothing happened
What happened: flashing procedure never starts
Do you see any meaningful error information in the DevTools?: Some javascript exceptions logged to the console. I'll follow up with another comment with the exception. I installed the previous stable release (1.18.11) and everything worked fine.
nevermind. after uninstalling and reinstalling the pre-release v1.19.3 it worked. I'm not sure what happened before. I was messing around with firejail and may have broken something.