Problems using adjustment brush!

[rmunk43]

Have version 8.0 Lr Classic.  When using the adjustment brush to make changes and using key O so as to see where brush is making changes the screen goes black and upper left corner of app "not responding".  Have tried checking and unchecking graphics processor, but same problem.  But if I do not use the key O then there is no problem.  ????`

Operating System

Windows 10 Pro 64-bit

CPU

Intel Core i7 @ 3.70GHz 31 °C

Coffee Lake 14nm Technology

RAM

16.0GB Dual-Channel Unknown @ 1205MHz (17-17-17-39)

Motherboard

ASUSTeK COMPUTER INC. ROG MAXIMUS X HERO (WI-FI AC) (LGA1151) 29 °C

Graphics

BenQ SW2700 (2560x1440@59Hz)

4095MB NVIDIA GeForce GTX 1050 Ti (EVGA) 27 °C

[Rob_Cullen]

What happens if you check the box on the Tool Bar (instead of using the O key)?  Does the problem occur the same?

If Overlay by any method is problematic then maybe a re-set of preferences or a full re-install of Lightroom could help.

[rmunk43]

It's happening even without having used the O key. If I restart LR it

doesn't happen for a while, but then starts up again. ?

Bob - rmunk43@gmail.com

[Rob_Cullen]

Sounds more like a problem with the Video card driver-

See the answer in Post#3 from Rickk Flohr at bug? photo doesn't show in develop module after import