I played on my notebook. i5, ram 2gb, gt540m 2gb, and I still have long loading time after clicking 'begin new adventure'. And then I got some lines of red error message : SCRIPT ERROR ON OPCODE 23: Invalid Script Parameter ID: 2; LINE NO 2.
Then I could continue the game.
PS.
I played with Edit Mode On, so I could browse all troops via character screen. Some troops' portrait on character screen holding their sword in wrong position.