I am not sure what happened to you but this last Sunday and today I use my P45+/Contax and ran thru 780 captures with no issues at all, it is running just as fast as 4.6.2. The only slight problem I found, which not an issue with 4.6.2 was that when I was waiting for the model for next make up and power off the back, when I repower it up and continue my shoot, the capture name somehow reset to "untitle", this is only small issue I found.
I must say the highlight/shadow adjustment is highly addictive, I hope it is available with my H3D system.
Regards, K
May be it was a OS issue, the problem of capture naming no longer exist today, which I ran thru anther 400 captures. I turned it off, and restart the computer and could not find the similar problem.