There were some early RF4 release issues with multiple datatables on the same page, however with the latest release
I have several cases where I have this working and the scrollbars are operational. One thing that can cause the scrollbars
not to show is if the packed.js file fails to load (if you are using resource compression) which you can diagnose using the
chrome browser "network" tab (or equivalent), look for any resources highlighted in red.
p.s. glassfish 3.1.2 shipped with a bug which caused resources over 500k in size to not load and patches are available.
The first thing I noticed was that edt scrollbars were missing.