Same experience after installing C8 on my system 2 (specs below). I had the 7.5 update already pre-installed and installed the full 9GB Cubase pro 8 without rebooting the computer. Then I saw exactly the behavior that you describe above. Totally weird. So I started 7.5 instead - suddenly buggy, too: outch! Not good. Multiple Windows updates- and graphic drivers update solved this after rebooting the computer. I noticed there are several threads about this all over the Cubase 8 forum. I am wondering whether it has something to do with the MS .NET framework, but that’s only a guess. On my other computer, I didn’t see this problem. However, both systems still show a very annoying delay and stuttering in the main meter and Steinberg Plugins meters. The Inspector Tabs are working as intended now.