Okay, I reinstalled Eclipse (version 3.0.1) and MyEclipseIDE (3.8.4), created my projects including the one that was causing the problems. I basically did the exact same thing that I did with the beta versions of MyEclipseIDE (3.8.4Beta) and Eclipse(3.1M4) and it worked flawlessly.
I gather from this that the combination of Eclipse 3.1M4 and MyEclipseIDE 3.8.4Beta aren’t ready for primetime.
Thanks for your help. I guess I should have stayed away from the beta products.