I just installed Lightroom 6.1.1 (I'm very used to Lightroom 3) and I'm seeing some bad behavior from the Develop module. Here's a short series of steps that sums up my experience:
The slowness I can deal with, but not the graphical glitches. I have a Lenovo X1 Carbon with all the latest Windows updates (from Microsoft) and driver updates (from Lenovo) installed. Any ideas?
Found the problem: GPU acceleration is ******. Once I turned it off, everything went back to normal.
Hahaha, the Adobe forum censored my reply above. GPU acceleration is similar to a pile of poo.