Forgot to mention. JBoss Portal 2.7.2
and what about RichFaces version used?
The RichFaces version is 3.3.1.
More details. After playing with this for a long time, it looks its not a problem with the datascroller but the whole portlet. After the datatable and the datascroller is rendered, if I click anywhere in the table (datascroller or rows), then the second backing bean is created. This second backing bean is associated with the table but only partially. I can say this because sometimes I can switch pages using the datascroller and the table is built sometimes from the original backing bean and sometimes from the new one.
Again, this only happens with SSL, works fine with HTTP. Also, it works fine with IE7 but not with Chrome or Firefox.