Enable "Coin Control (experts only)" in options, then go to Send, then click "Inputs". This will show you the current state of the collateral TX, which needs to be exactly 30M. You may need to re-do the setup.
Yes you can't stake and run a masternode at the same time because it blows up. You have to lock the wallet after starting the node.
Dear btc22,
Thank you for your help.
I will re-do the setup andmake sure I have exactly 30M in the wallet.
If I unlock the wallet it gives an option "Staking only". I assume I have to de-select that option.
Should I put staking=0 in the wallet conf?