The new kernel 188.8.131.52-33.fc7 in Fedora 7 repo has an auto mount bug. Also reported back in 184.108.40.206-27.fc7, USB flash drives won’t automatically mount. Reverted back to 2.6.21-1.3228.fc7 and all is well.
Also, update autofs package. Earlier version that came with the Fedora DVD shows automount hogging up CPU! On top command, it shows up to 25% CPU even when it’s supposedly not doing anything. That is very high!