Greetings,

----- Original Message -----
> FWIW, the CentOS Livemedia is spun from the livecd-tools found at
> http://people.centos.org/arrfab/CentOS7/LiveMedia/RPMS/

Ok, I tried that livecd-tools package and had the same problem.  iso builds, iso boots, installer works... but post installed system is non-bootable because of bad grub setup. :(

Luckily the cause is known and the fix is known so hopefully this will get resolved by someone upstream.

TYL,
-- 
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]