Bizarre! It works fine using that key sequence on the mobile skin ( same browser ) but not on the default skin.

 

it is setup to make that key work. Not sure what else to suggest.

 

Quite sure you have bigger things to worry about, I'll do the usual temp files clear out and try a different machine with the same browser, it must be 'me' somewhere ..... i'll just have to work out what i haven't done