What version of VLC are/were you using? I was on an outdated 2.x that didn't love running on a 4k desktop, but updating to whatever is newest fixed things and it played perfectly. However, the UI scale is waaaaaaay too small - the VLC 3.0 nightlies address that.Does anyone else get bad screen tearing when playing videos in VLC player?
Not a biggie though, since I have since changed to MPC-HC which is for the most part tear-free. It also seems to be much better at upscaling video, and has less jagged edges, Just wondering if it happens to anyone else.
Also, try enabling full-panel GPU scaling in your GPU dashboard if you haven't already. That remedied a ton of the weird little bugs I first ran into when making the move to 4k desktop resolution.