What is happening?

You have just done a full clean and rebuild of a bunch of projects and yet there are red x error markers on some WOD files here and there with errors such as "the class cannot be found" and you know it was all fine 5 minutes before.

How to fix

Courtesy of Lance French who compiled this procedure from mailing list discussions:

1. Close Eclipse
2. Delete <workspace>/.metadata/.plugins/org.eclipse.core.resources/.projects/<projectname>/.markers for all affected projects.
3. Run eclipse -clean and then shut down eclipse.
4. Run Eclipse and load the workspace
5. Clean all affected projects.

You should now be back in business ...