I was talking to an architect at a new WebCenter installation over the last few days, they were having a lot of strange issues with pages not rendering correctly, parts of the page missing and the layout getting all messed up.
Turns out the issue was due to a bug in the JDK version they were using, 1.6.0 update 18, and was resolved by upgrading to update 21.
So, if you are installing WebCenter, learn from their experience and don’t use that version of the JDK!
