The bzip2 package no longer provides the libbz2.so.0 link/library, which is needed by the Helix gnome libraries, among other things.
Because it is a newer version. Use the GNOME shipped with pinstripe, and you'll be fine.
So let me guess this straight... Once the Redhat final 7 is out, the Gnome that comes with that is the only Gnome I can use? Or did I miss something, like actual backward compatibility? :-)
Gnome is among Red Hat Linux' core libraries, so yes: We expect you to upgrade to them: Same way we wouldn't like you using an older glibc with this release.