To my knowledge the half-black screen issue had not been reported yet. It has happened to me several times, but I was unable to reproduce it on another computer so I assumed it was something on my end. Just to check, do you have any extensions installed and have you been able to spot it using IE or Opera?
The read posts issue has been reported but like a couple other issues seems to be eluding the engineers. It's one I certainly hope to see corrected soon, though thankfully it has been less prevalent for me the past couple days.
Load times, though, have been faster for me as a result of moving to the new servers. Then again, I block a couple advertising servers that are used here and are known to slow down load times now and then. I'd suggest doing the same and seeing if that clears it up.
John