If your Eclipse Problems tab looks like this after upgrading to 3.6.2 (Helios)...
...and you're having a hard time turning that off, here's what appears to be the answer:
The Suspend all validators checkbox on the Window > Preferences > Validation screen is broken (or partially broken, its behaviour is a bit erratic). So ignore it.
Hope that helps somebody! I've reported this as bug 338759.