I'm testing a mobile application built with the Cordova framework running on my iPod (iOS 9.3.5) plugged into my PC. The Safari Web Inspector is running on a macOS Sierra VM (VirtualBox). This worked perfectly for a while, but at some point the web inspector became blank. Sometimes it works again, sometimes it breaks for no apparent reason. I also tried with Safari Technology Preview, it worked for some time but also stopped to work, except for the Reload button.