I'm getting error messages : terrian.dll (error), facilities.dll (error), g3.dll (error). This only happens when I'm flying in the Carribean. I've removed and re-installed twice, hoping this will fix things. Anybody, please help.

Any addon scenery or mesh or AFCADS for that area ?

confirm that you can fly this area before adding any add-ons. Check the stock installation.Then check to see if you have a legitimate copy of FS.

Yes. I just brought VFR France, St. Marteen, etc...