Not sure what's going on, bug or something daft I have done.
Just created a simple site (really simple) at http://browsermail.co.uk/ and it looks fine on normal Desktop browsers but I just can't get it to work on mobile (android/chrome) - even the position of the text is wrong!
Its just a couple of text blocks with an Breakpoint of 480 set (using the new feature) to 'Activate breakpoints when browser window is smaller than the device width' which I presume is how it used to work? Also, what do you mean by 'smaller than the device width', ie if on Android/Chrome you can't make the browser smaller than the device. Looking at the built-in help, it looks like the word 'device' should be changed to 'defined' and that would make sense

Cheers