Hey,
after doing a few tests, I've realized that material node system is the main source of problems I have.
I love how nodes work, but I'm not able to create corectly working presets libraries of my objects, textured with node materials.
I'm loosing textures (they are not copied to tex folder in presets), nodes inside materials dissapear (especially layer and filter nodes).
Also textures are not visible in texture manager...maybe here is a problem.
After convert all materials to old, non-node system (I mean after build them from scratch :) ) all my problems has gone...
But I want to say I love Corona, quality of renders and speed, and I'm very happy you are doing this great job. Thank you!
I hope all these issues will be fixed shortly...but in the meantime I switch back to old materials.
Cheers!