I was really looking forward to testing the CPU-gentle v1.42, but my app immediately failed.
To make the longish story short, I ended up having to define
window.CESIUM_BASE_URL = ‘//Cesium/’;
Cesium is loaded with an absolute path from a PHP script in another dir, which is probably the cause of the problem. Strangely, the unminified version worked fine. The hint to resolving the problem in my case came after using the Skalman uglifying/minifying routine “manually”, which produced some ugly errors in the debug console.
I have not dug into the changes from 1.41 to 1.42 that produced this problem, and although my solution is probably robust, the root cause should probably be looked at.