I too have been unable to move any substantial sum of DSH out of my wallet. I have resynced the blockchain and reset my wallet and although I can always get them to show back up in my wallet, I can never successfully get them sent anywhere. Very small amounts will send, but even the larger amounts that are failing are much less that the max TX size. If I have a few 100M DSH to move, would I need to do so over 1000's of TXs?