I already deleted the project and had to copy all the channel strips to a new project, together with the midi data.
There's no need for a screenshot, just when I clicked a random midi region, nothing showed up in the piano roll. Trust me, I know how to find the piano roll window 🙂
And in my new project I experienced again some bugs, all my Nexus synths suddenly used another patch, and I didn't do anything that copying midi data from the one project to the other.
When I got this fixed a new bug appeared.
The slider of a track was moving very fast a few dB up and down, although no such automation was programmed. I deleted the region and started all over, this time it was ok.
THis is really to cry, I can't work like this. Dunno if it's Mavericks or Logic that got the bugs, all I know it's frustrating.