Chantal-
I tried the new tour on several browsers on my Android tablet:
BROWSER (the default browser that came with my tablet): works fine
CHROME: does not work properly, black areas/missing tiles?
DOLPHIN: works fine, perhaps loaded a little slower than the default browser
OPERA: very slow to load, but eventually worked - sluggish
FIREFOX: very slow to load, but eventually worked - very sluggish and locked up several times
iPhone and iPad: works every time very nicely