Horns: They messed up with the first 1.7 update patch, and provided a new version of it a couple of days later which fixed (most?) of the problems. You just need to get the instrument files again and it should be working, if I remember correctly. There was a topic here about the CB 1.7 update some time ago, which has more help than any of their customer service could prolly do.
Strings: You, me and everyone else is still royally forked on this. And it's not only the hanging notes- the CPU usage is killing me as well. I was told that the new legato patches are "more demanding" when I asked about it, but when I told them that it's every single patch that keeps spiking my CPU they didn't bother to get back at me anymore at all.
Too bad, because I really started to like the sound of the newest update after considering 1.2 more or less "an expensive mistake" soon after I had bought it.