On Mac MBP M1 v13.2, Webcatalog vv44.8.0 (arm64), with Gmail installed, when you close the window, and reopen it, you get about 6 popups saying "A JavaScript error occurred in the main process."
I have tried to Reinstall (Repair) Gmail, uninstall/reinstall Webcatalog and start fresh, uninstall/reinstall Gmail, and nothing has fixed this popup error.
This happen with any app install on Webcatalog, not just Gmail. I then have to Quit the app, and launch it again.