I encountered a strange problem when switching from three.js version 67 to version 68. In version 67, everything appeared correctly (triangles behind transparent triangles were visible), but in version 68, something seems to have gone awry.
Below are two fiddles with identical code, but using different versions of three.js:
Version 67:
http://jsfiddle.net/gv6stpud/
Version 68:
http://jsfiddle.net/mkb9m3h5/
Can you provide any insight into what might have caused this issue?