Shared Master layer gets deleted after saving!

Hello, I have a big problem: OG is not saving my layers and shared layers correctly. I don’t see any what exactly causes OG to mess up my layers, but in fact it deletes the shared master layer. It does that regardless if saving as / duplicate or export and re-open.

I have been working for almost 2 hours on a wireframe after upgrading to 6.0.5, very frustrating. Any ideas what to do? I already repaired ACLs, performed a PRAM reset and reinstalled PG as well as OSX 10.9, but this behaviour remains.

It’s frustrating to waste so much time due to a software bug. I never had a bad experience with OG yet, is what surprises me the most.

Thank you, any help is more than welcome.