Hi, I'm sorry for the delays in the development. We are seriously understaffed, so the work is not as fast as it should be.
As to the problems with the proxy: there were some issues that I have fixed and that will be available in the next build (when it's ready :) ). However, the proxies do not (and at the moment cannot) support textures and materials, the .cgeo files store only pure geometric information. In the long term, we want to revamp proxies to support seamless integration of 3rd party objects, including material and texture information.