Semantics error in c

I think it has something to do with the workspace/.metadata. I had the problem of semantic errors reported but Hello World compiles and runs. I deleted the project, created another one, same error reporting. Reinstalled CDT, same thing. Deleted the workspace, shut down Eclipse, restarted, created new hello world, same thing. Deleted the workspace again, shut down Eclipse again, this time noticed that Eclipse had recreated the workspace folder during shutdown when it couldn't find it. Deleted the workspace with Eclipse shut down. Restarted Eclipse, created HW project, errors show for about a second and then gone. Deleted project, created another one, errors show for a sec, then poof. If you actually had projects in your workspace (mine was a clean install), I bet that you could just delete the .metadata folder within the workspace, and it would fix it.