[CentOS] C6: Gparted "the kernel failed to re-read partition table"

On C6 (latest) I wanted to add an extra partition, number 14, to a 1TB
GPT disk.

It failed repeatedly. The error message is:-

~~~~~~~

GParted 0.19.1

Libparted 2.1

Create Primary Partition #1 (ext4, 33.00 MiB) on /dev/sda  00:00:01   
( ERROR )
calibrate New Partition #1  00:00:00    ( SUCCESS )     
path: /dev/sda-1
start: 613591359
end: 1953525134
size: 1339933776
(638.93 GiB)
create empty partition  00:00:01    ( ERROR )
libparted
messages    ( INFO )

WARNING: the kernel failed to re-read the partition table on /dev/sda
(Device or resource busy). As a result, it may not reflect all of your
changes until after reboot.

~~~~~~~

Does C6's version of Gparted work with GPT disks ?

Thanks.

-- 
Regards,

Paul.
England, EU.      England's place is in the European Union.