I am a little new to fedora or fedora 12 but....
blender is one of the few programs that has crashed my machine being locked up in a render
or some other action - none the less ---------- all of my errors came from not having the
video setup correctly - after finally tracking down a GOOD tutorial - even though the steps
are all over the place - you have to install then change the kernel setting in grub - so the new
default nvidia setup that makes it look pretty even on the live disc - is ignored after putting the
drivers in ...go back and use terminal and edit - read the link ..
I had to change the 3d acceleration on my machine
http://rpmfusion.org/Howto/nVidia
on reboot if you do it right you dont get a screen of doom and I did this before installing
the updates on a clean install ...fixed the video ..and it worked after a few attempts
if you upgraded to F12 without clean install - it would be easy for it not to work
and there were two versions of blender in the repo because its gone through a lot of
changes
I would try to remove all of the files blender installed - and wait until your system
settles down a little bit from using F12 - updates and fixing the video drivers
see if it does not install then - blender is also fairly dependant on a multitude of libraries
it may be hard to render certain image types without it being installed correctly
building it from SVN is also possible - in fact you can build it with different features from source but
- check here for alternative builds
http://www.graphicall.org/builds/