Hey Chris,

I just looked into this issue and it turns that when you manually loaded the package you probably loaded Seaside2.8a1-lr.597, whereas ConfigurationOfSeasdie28 was loading Seaside2.8a1-lr.596...

Seaside2.8a1-lr.597 has a fix for Issue 517 in which WaFileLibrary>>fileSelectors was broken in Squeak...which caused the css files to not be sent to the browser ...

I've saved a new version of ConfigurationOfSeaside28 referencing the new mcz file...

Dale