Alex, thanks for the information.
I was trying to find a previous graphics driver version for you to test but it is not available any more.
Then, I looked at Lenovo’s website for a graphics driver and I found only the Monitor INF file.
If for any chance you have the original CD that came with your laptop, you can try to install the drivers from there and check if the behavior persists.
In the mean time, I’m going to check with the Graphics team if they have heard or noticed this problem when using these drivers versions.