i have Beta 9 installed. i went from version 3.* to 4.0.0 beta 9.
never installed an alpha.
Edit: recreated the group and seems to be working fine now.... weird.
Edit2: as soon as i entered combat the frame went away then when i left combat the new raid frame came back and the exact same thing i had before showed up ON TOP of the one i redid even though i deleted the old one. here's a screenshot:
EDIT 3: after restarting WoW again it seems to be working fine.