The new parallel rendering engine in Liferay 6.2 is incompatible with a feature in Liferay Faces Bridge that provides the ability to remove duplicate resources in the <head>...</head> section of the portal page. This is causing a test failure in the FACES1635ResourcesTest.
There are three known workarounds:
1) Disable parallel rendering in portal-ext.properties:
2) Add the p_p_parallel=0 query parameter to the URL in order to disable parallel rendering on a per-request basis
3) Set the value of <render-weight> in each JSF portlet's WEB-INF/liferay-portlet.xml descriptor to a value > 1. That should cause the portlets to render serially, rather than in parallel.