Hi Krzysztof,
I'm glad it's just not me! Thats not to say though I'm pleased your having the same problem!!
I've been into the Apple store in Birmingham who had a look at the screen shots and thier opinion was it's not a hardware problem or anything I'm doing wrong, they were adamant its a bug in FCP X and advised me to write Apple and email explaining the situation and showing the screen shots.
I'm happy to do that apart from I cant find the appropriate email address to mail them so I'm going to pop into the store agian today to find out where I send my rant.
My files out the same as they play back in FCP X, plus I cant even back step to 10.0.0 because all the events will not read in 10(I did back up all the events to 2x drives but its affected them all), so all in all its a whole lot of software and work that I cant access.
Let me know if you've had any better luck?
Best
Adrian