We just uninstalled the web module and it still does not launch. We get no error. The launcher says it is downloading projects and then just disappears. I just checked and we are also having launcher problems on Windows machines. The launcher version is 7.9.9.
Just wanted to add that I was having a similar problem getting my RPi3 to connect to the Ignition Demo VM v7.9.7.
I could connect to the gateway and get to the login screen, but as soon as I entered the credentials it would show the loading icon and then just freeze.
Spent a couple of hours messing around last night trying to fix this issue, uninstalled and reinstalled Java, tried using the legacy native client launcher all to no avail.
In the end I had to uninstall the Web Browser module on the gateway and now the RPi client is working fine.
Maybe this is a solution: