https://bugs.gentoo.org/754966
https://github.com/AcademySoftwareFoundation/OpenColorIO/issues/563
Fixed upstream in a larger set of changes.
--- a/src/core/Config.cpp
+++ b/src/core/Config.cpp
@@ -330,7 +330,7 @@
                 sanitytext_ = rhs.sanitytext_;
                 
                 cacheids_ = rhs.cacheids_;
-                cacheidnocontext_ = cacheidnocontext_;
+                cacheidnocontext_ = rhs.cacheidnocontext_;
             }
             return *this;
         }