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So Amazon just announced Amazon Lightsail and I moved my server over from Amazon EC2 without thinking about whether Sendy would work or not.
I can login and browse some things but the main settings doesn't work, and I'm assuming it's to do with AWS credentials.
Amazon said Lightsail can talk to all their AWS service so I assume it can probably be done.
If anyone figures this out please let me know, meanwhile I'm trying to make it work myself.
It turned out the blank page was due to a missing PHP7.0 extension.
apt-get install php7.0-xml
Installing php7.0-xml fixed the problem.
Glad to hear you've found the issue causing the blank page.