where is 'refresh sequencer' in the VSE of 2.8? I insert a scene from the 3d view into the VSE, and as expected it has specific frames where its displaying pure grey or just plain wrongly. 2.79 had a big fat "refresh sequencer" button, which you normally pound to fix this problem. I can't find anything of the sort under any of the tabs I find in the vse viewports. Where is it? And if it's not there how am I supposed to refresh the strips so I see the right thing? the control+r thing or whatever the hotkey for "refresh strip" never had anything to do with fixing this problem in 2.79 and it doesn't here either.
You'll find it in the View menu: