i'm currently using wallet "datacoin-0.8.6.0-linux" and it appears fine, bit slow to open, and very slow to sync compared to say Primecoin wallet. So i think the wallet needs some more optimising.
(I opened DTC and XPM wallets together, DTC was 39 hours behind, and XPM 6 weeks,,,,,DTC is still 11 hours behind, and XPM has synced)
This is not really a Datacoin problem. The derivatives of the upstream Satoshi reference client in the 0.8 branch run dogshit slow.
We have over 2 million blocks.
Faster synchronization happens with the newest code.