You might want to take a look at this thread:
"Which LaTeX distribution in Fedora 10?
(See esp. post #2)
Here's another suggestion you might want to try: deleting your current TeX Live 2007 installation and then installing the "plain vanilla" release of TeX Live 2008 from scratch (by downloading it from TUG's website: http://www.tug.org/texlive/acquire.html
). This info came to me via e-mail from Karl Berry, the co-editor of TeX Live, so it is authoritative:
And therefore the standard TL install (from, e.g., the DVD) does not affect any system TeX installation or interact with the system packaging in any way whatsoever. It is completely independent. It installs itself by default under /usr/local.
As for being skilled enough [to install TeX Live from scratch], the defaults should work fine, so if you have about ~1GB free disk (it installs everything by default), all you have to type is one character: i (for install) . . . . If you install the "native" TL, you can have exactly the same TeX installation, distro-independent.
I haven't tried this myself; I'm still using the Fedora 9 TeX Live package from the standard repositories. If you try, maybe you can report back and let everyone know how it worked for you. HTH.