Layers.library 45.21 working great here so far, it was nice to be able to turn Birdie back on, I'd disabled it when it didn't work with the previous new layers.library.
I also was unsuccessful in extracting rtg.library from your split zip archive thingy. WinRAR couldn't put the two pieces back together again, and I'm not downloading and trying to figure out WinZip just for that.
Now that I'm messing around with turning things on & off, turns out that my 4.x-like VisualPrefs gadgets really down my system. I'd always thought that was Birdie, doing that. Huh, might have to re-think my patches!