Hi,
I am playing the latest 1.1, and never seen this bug on any version I played on before, not even the betas. I quick-saved my current game (metaverse, so no mods, medium, painfull all, occasional everything), and had 2 mining starbases, the AI had one I was aware of, and now when I loaded it, they are all gone! The resources are there but no mining starbases.
Sure now I am building fast constructors to take them but....
So yeah, bug. However maybe it is worth mentioning that few minutes after I saved my PC blue-screened and had to restart. Maybe the game was not properly saved due to the blue screen.
Thanks for a great game otherwise though.