Have you had a look at this pdf on the cashflow web site;
http://www.cashflow-manager.com/aust...7_on_Vista.pdf
There is also a video;
Copyright Cashflow Manager 2007
But to answer your question, hardware wise your Mac is no different from any other PC. So any troubles your having would be software related. Make sure you have the latest updates of Vista and Cashflow manager.
EDIT: Ha people beat me too it, serves me right for watching the video :P