Try out IrfanView on the PC, there it works.
Alternatively you can use double buffering as an option.
Currently the screen flickers, and that is what distracts.
If you might want to get rid of this flickering you are welcome, if not, I don't care, there are other viewers which can flickerfree paint images.
I surely do understand, still flickering is distracting. That is probably what you did not understand. Thanks anyway.