It's a known issue that the devs (apparently) have addressed in the latest beta release.
All of us Mac users just have to be patient and wait until they release the next version to the public.
Please don't ask when this will be happening as it will happen when it happens and there is nothing we can do to resolve the texture problem until then.
Believe me, I know it's frustrating and it makes it difficult to make significant changes to any routes when the textures screw up like this during an editing session.