Found another glitch with Project Server 2010. Graphical Indicators are not showing in the Project Web App (2010).
If you add an Enterprise Column to Project Server 2010 that is calculated to show different icons depending on values etc then add the new column to a tasks view such as Tasks Summary, and then publish your project via the Web App the indicator will not show.
In order for the indicator to show you need to publish the project from Project Professional 2010. If you then subsequently re-publish via Project Web App the indicator will dissapear.
The only way to get indicators to show in Project Web App is to publish the project from Project Professional 2010.