Im using compiled wallet from source on linux (no gui , just the cli) ... so its just the basic
./go-soil/build/bin/gsoil
and from it i do
personal.unlockAccount(eth.accounts[0], "passwd")
eth.sendTransaction({from:eth.accounts[0], to:"addr_to", value: web3.toWei(amount, "ether")})
!?
That is interesting. I also am running gsoil (1.6.7) on linux compiled from source using go (1.8.3).