Hi Emmet,
While Upgrading try to upgrade to DS 1.5 Sp01 Patch 1 , DS 1.5 and DS 1.5 SP01 , has severe bugs which will cause unneccasry problem, pls find the link below .
(Patch Released) Serious Issue with Design Studio 1.5 SP1 on BIP
Design Studio – Error Configuration SSO with O OLAP Connection
Regards,
Bala