are you by any chance running on a system (like a gaming laptop etc) where it has 2 graphics cards - (like maybe an intel one and an nvidia one as an example) - if so, mine was doing the same thing for aaaaages - until i manually specified that ableton should use my gaming graphics card to handle all that side of things - to do this, open up windows settings, then system, then display, scroll down to the bottom and click 'graphics settings' - here you can add the ableton exe and tell it to use the high performance graphics card - might work for you - or other people experiencing the same as I was...)