Hi Phil, nothing I can reproduce here. I tried with the latest/fresh Pharo 3.0 (build 30858) image. No problem to load from script or config browser. Also CI is green.
Are you already using Pharo 4.0? Then it might be related that the prerequisite Seaside version may be not yet be ready/supported for Pharo 4.0. https://ci.inria.fr/pharo-contribution/job/Pharo4Seaside/ Bye T.
