in my experience, this is not related to 7.0.6 only.
I had cases with the TI crashing on Windows 7 since 7.0.0.
I also had TeamViewer sessions with some users and to me it looked like a Graphic Card related issue. Can't be 100% sure though.
The performance was a little poor on those systems (not depending on the PCs' specs) and the users have often experienced long load times of the Editor and black, blue or white GUI, with no controls shown.
Why some users are seeing this after a Cubase update is hard to tell. It is also hard to tell if it can be another software interacting badly with the GPU.
The amount of cases didn't provide enough info to cross-check common issues, similar components, etc. - but in all cases I verified a DPC issue (the users ran a LatencyMon test) with an nVidia dll and a Kernel NET Framework component called "wdf01000.sys" the latter is becoming more and more common during the last month, so it might be some OS update causing this increase of the reports. Unfortunately, updating the driver and .NET packages didn't work in most cases.