Hey Linda ....
I thought it might be an update issue as well ... but ... my version is as up to date as it can be.
Rumor has it there's a new update for Fireworiks CS4 coming out this month that addreses this problem. Keep an eye peeled for it.
lol ... that's exactly what I was thinking.
They are introducing the CS5 suite today actually.... so ... I'll sit tight and wait.
I have had similar problems with AfterEffects and Premiere.
I've COMPLETELY uninstalled and reinstalled the CS4 suite and I still have issues with those two.
Now three with Fireworks.