Now I'm also getting this error when trying to send 10000 SNG:

Going to be hard setting up a masternode if I can't even send the collateral.
I've sent 10000 SNG to the new address in smaller increments. Clicking on Get Outputs button does not show anything.
not sure but I think you have to send exactly 10K in one transaction. Thats what i heard from every mastrnode guide out there regardless of coin/algo.
Wallet wouldn't let me send 10k at once.
i didn't have 10k muck coins to test ,maybe you can test it yourself ,once 5k 2k again and again ,good luck~