There has been a change in the form of URLs in a JSF application running over Portlet Bridge (PBR 2.2 vs 2.1). The change has been noticed in URLs of images.
PBR 2.1.2.GA.EPP51 generates portlet-style URLs starting with "/portal", i.e. the following code
produces an HTML element looking like this
With PBR 2.2.0.GA.EPP520, the same example produces the following element
This initially caused some problems during testing in clustered environment with load balancer set up to handle "/portal/*", thus not handling images properly with PBR 2.2. It's not strictly a bug and there haven't been found any bugs directly related to this change (neither in RichFaces components, nor over WSRP).