I am using a professional edition of MyEclipse IDE version 5.1.1 GA for almost three months now. Out of the blue, I started getting 'cannot be resolved' errors in the Java sources in the import statements and object references throughout (red lines, red X boxes). Nothing has changed in the Build Path, and those packages referenced do exist.
Previously, the same problem would happen in the trial version - especially with JSP files. So I upgraded to a paid subscription, and this just started happening again. Any ideas on how I can resolve this? (Its annoying, plus the debugger doesn't like the errors.)