I'll look into it, it sounds like an incompatibility with Ren'py... In any case, I update to the latest version of Ren'py with each patch so hopefully it should be fixed soon.
Viewing post in Coquette Dragoon: Volume One (Early Access) comments
For what it's worth, you should also submit a bug report with the platform/OS when an OS update breaks a program. The saying, WE DO NOT BREAK USERSPACE, is relevant here.