Hi cloudduster,
Thanks a lot for your time to test the plugin again!
We are very sorry for the issue. The issue was caused by a PHP version related bug in a core that is currently in beta.
We have added PHP Unit Tests and a Travis CI build test and the issues are now solved voor PHP v5.4+.
https://github.com/o10n-x/wordpress-cloudfront-page-cache
Our company is focused on cutting edge innovation first. We were planning to add dedicated test engineers to the team to convert the innovation into reliable plugins but we didn’t find an engineer yet (there is a vacancy on UpWork). Our test server has just recently been installed so we are behind on that aspect. The plugin was already working well in newer PHP versions. With the new build test, the plugin will be more reliable. Next updates will be distributions from Travis CI after passing more comprehensive tests.
If you are still interested to test the plugin we are very interested in your feedback / feature requests!