When I switch from Library to Devlopment LR hangs. I have to kill the task and start LR again. I had the problem with Lightroom 6.0 on Windows 7 and still have it with LR 6.1.1 and Windows 10.
Try to disable the gpu under Edit > Preferences > Performance.
that also explains how to disable the gpu when LR is not running. (if you have problems disabling it inside LR)
I have disabled the GPU as you recommend and ... it works ! Thank you very much !