only thing i can think of is the account settings (shown as a cog icon at the bottom left of the screen in the management screen), find "general" tab which would be default on loading up to the account settings page.
the first choice you run across is the race graphics quality, adjust it down by clicking for example; "5: best" it should rotate to the next number, start at "1: basic" and see if that helps. however there is
this forum thread about some of the issues encountered, if there is something there that may help as well.