Hello ! After updating Photoshop CC 2017.1 I had such problem. I was making some visual at work. In the project there is some Vactor Smart Object layers. After saving my picture as png I saw that there some strange object appeared. I was thinking that maybe there is something wrong with VSO layers, so I opened them in Ai and there were no redundant objects on it. I've tryed to reopen project, to close photoshop. Nothing helped. I have same issue long time ago, but project was too comlex, but here's nothing special. Have any idea, what can it be ? I work in Photoshop on Mac OS.
Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?
Thanq ! It helped !
Alas, that is no proper solution as it invalidates GPU dependent features (like the Rotate View Tool for example) but it indicates problems with the GPU driver or the OS.