here's an advice for everyone...
when you have some spare time (preferably evening time) sit down in your sofa, make yourself an instant coffee cup and start reading ALL the manual(that is the "Project64.chm" file which can also be reached via the help menu). you will find that first: all your problems are explained there, second: you'll be able to get the max out of pj64 and third: it is amazingly interesting and very well worth the read for everyone.