We have a new release of SilverStripe available: 3.0.3-rc2
This release fixes two regressions present in 3.0.3-rc1 and one security issue. Details in our upgrading guide and changelog at http://doc.silverstripe.org/framework/en/changelogs/rc/3.0.3-rc2
Download here: http://www.silverstripe.org/assets/releases/SilverStripe-cms-v3.0.3-rc2.tar.gz
Post bug reports here: http://open.silverstripe.org