Well, to come back to the original Bug-Problems:
I just made a post with a video showing the Tempotrack - Issue. Please watch and then think about it. And to write it again and again: In Cubase 6.5 latest as well as in older versions this problem does not exist.
This has to be fixed. Not only in months, this has to be fixed in days. You are not able to work in Nuendo otherwise, I will write an invoice for the lost time soon if stuff like this continues to mess with my time and nerves.