For those playing Football Manager 2008 for a few seasons now would have noticed several irritating bugs like players not closing down, too many disallowed goals, lack of penalties, etc. Basically SI has given us a buggy game but they have addressed these issues and have released a beta patch.
An official one is due in the coming weeks once they have tested this patch fully. Good news is, your current savegames would be compatible with the patch, no need to start a new game. Although the general advice that they give is you are better off starting a new game.