I'm running into this as well. I'm using the "CloudGuard IaaS (R77.30) Next Gen Firewall & Threat Prevention (BYOL)" from the AWS marketplace. I've bumped it up a few times in specs trying to fix and now have it running on a c4.4xlarge (16 vCPUs, 30GB mem, 60GB disk). I can get to it with SSH and set the admin password, and then Gaia fires up and let's me log in. But then after log in the page never paints. It's just a white page. It doesn't even seem to be downloading or working on anything. It's just blank. I'm using Firefox 62.0 (64bit) on Mac 10.13.6. Any help appreciated.
UPDATE: Used the advice above to run the initial config on the command line, but even after that, Gaia still comes up with goose eggs. Since I was setting this up specifically to test things in the UI, it is pending and currently shut down. Any advice welcomed.
UPDATE2: It occurred to me that the problem could be with the exact AMI I'm using, so I'll note it's "Check Point CloudGuard IaaS BYOL R77.30-041.168-fb3a4d3c-c993-40ab-ba19-b180ea9b866f-ami-55202c2f.4 (ami-da6652bf)" in case that is information that matters. I'm running in us-east-2 (Ohio).