First thing first. Congrats to the M8 team on delivering a great RC1. The improvements over 2.X are fantastic!! Especially the addition of a scratch/moveable playhead.
I Thought I would put down my thoughts on RC1 as they aren't bugs (mostly) but I think there are a few things worth mentioning.
1. One of my my main reasons I've championed M8 is that the UI is so easy to use live, I have found that without the Orange colouring of the selected layer it has become VERY hard to tell at a glance which layer is selected or which ones are muted. I would say this is the number 1 issue with the new UI. Also not having buttons highlight in Orange when active makes it hard to tell what is active in a performance environment.
2. Fit to stage button, changing this toggle from a Fill to stage/Normalise to a Fit is a real pain if you are using 4:3 material on 16:9 stage. I would suggest having both Fit & Fill buttons
3. A small bug I seem to be having involves midi control of parameters on a Filter Effect not taking effect until that Filter is selected via the mouse.
4. Another bug I seem to be having is that both live text and .png files don't seem to work correctly with Premul, SCR & EXC layer modes. They just come out as solid blocks of white in the shape of the media.
4. Finally I'm not sure how it has operated in the past but how is the centre crosshairs for a non/visible layer activated? Has this changed between versions as I now seem to only get it sporadically.
Thats all for now.