If you leave the game running for a while without doing anything and then come back to it, none of the functions work - You cannot even log out!
In the 'old' game format - The screen used to 'grey out' and a message regarding inactivity would be displayed. Clicking anywhere would resume the game as normal. This does not happen now and you cannot resume the game unless you do a 'refresh' (hard reboot).
This is very frustrating if you need to leave the game to do some 'real work' and then come back and find you miss a comp start due to having to re-boot the game.