Description of problem: Cannot install system with gfs2 as filesystem. An unhandled Exception occurs which contains "ERROR : Error running mkfs.gfs2: No such file or directory". How reproducible: Start installation of Fedora by adding gfs2 to the options which are specified in the DVD's grub. Leave everything as default and specify swap, /boot (ext3) and / (gfs2) partition. I defined these partitions on one disk. Continue installation with default values. Exception occurs when Fedora tries to create the filesystem.
This will be fixed in the next build of anaconda. Thanks for the bug report.