@Thomas Richter
This new version of layers.library is so far working fine with Birdie.
See attached screenshot, where I show nice OS4 like window borders with Birdie and then on the CLI I show that your new layers.library is doing its thing.
BTW, I couldnt extract your new rtg.library from the archive, due to bad crc. I downloaded several times both archives, but I still get the same result, layers.library gets extracted fine but rtg.library doesnt.
Thank you!