When a mount point in /etc/fstab is actualy a soft link to a directory, the mount and umount commands work fine, but "usermount" will fail to unmount the filesystem after successfully mounting it.
This appears to be fixed in our build tree. Try updating to the latest versions of the mount and usermode packages from Raw Hide (ftp://ftp.redhat.com/pub/rawhide/i386/RedHat/RPMS/) and see if they help.
Closed due to lack of input. Please reopen if this problem still occurs.