Hello. I have a strange behaviour of Lightroom - when i edit photos and apply any operations (exposure, contrast, filters, etc.), usually i get some square artefacts on main preview screen. It is very annoying.
I tried to reinstall Lightroom, to change it media cache directory, but nothing helped.
What is the problem? I have good cpu (i7-6700 CPU @ 3.40GHz), 16 gb ram and nvidia gt730 video.
Please read here: Image previews and thumbnails look tiled or broken on Windows
Also, try to deactivate the GPU acceleration: https://helpx.adobe.com/lightroom/kb/lightroom-gpu-faq.html#troubleshooting
Thanks! Now everything seems to be working fine!