Garry - Yes Menu Tree is fine for IE8 with #5254 , a very speedy fix

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One other oddity I noticed was during the install (again using IE8). When it gets to the final summary page:
install/index.php?action=summary
Even after checking the confirmation box at the bottom, the ’Install’ button did not appear. I have to go back a page, then forward again, recheck the box and move my cursor to where the Install button should be to make it appear! ... this may be one for a bug report?, though I don’t currently have an rc1 install to check it was not working back then.