Beautiful to talk with you again!
1-I've a very slow Internet connection and I didn't yet took the time to download the 10.6.7. Do you think it's worthy?
2-Yes, the project, any project, opens and works perfectly.
3-It doesn't make any difference: any Logic project I open on this computer since today it does this joke. (with MacBook where I've exactly a specular situation the problem doesn't exist).
4-No, nothing in 64 bit.
5-Yes, it crashes when I try to import project settings from a different project (as I did before 1.027 times!!). It's actually a strange kind of crash: Logic doesn't disappear, It just blocks with the colored round wheel spinning for ages..
I'm thinking that the only different thing I have done on this computer (...I didn't on my MacBook) it's installing the special music fonts for contemporary music (Ski's idea ...). and it actually worked fine. Anyway I did uninstall them, but nothing changes.
Nothing I can add, I guess.
Once more: thank you for your time