Thanks for the replies.I'd like to comment on each one so here we go :):)
the user reg is ok for me - i created an account, refreshed and logged on with it. the game as it stands has no db connection, so if you come back an hour later Heroku will have put the app to sleep, effectively resetting all of the user info. this may be what you experienced?
It must be due to the UK severs cos it's almost instant here, and i've had about 20 people on at one time testing it... however i admit originally i accidentally hosted the server on a US heroku server and it was nowhere near