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I had a similar issue, but found the account approval/signature had to take place on both chains. I downloaded the non-fork chain on a different user account in my laptop. When I switched over to that user and booted up Ethereum-no-fork, there was an approval sitting there. Hope that helps someone. :)

when does the fork/nonfork option show up?

Can you confirm you have a balance on both chains?

Can you clarify 'this'? Multisig will require the correct amount of signatures to send Ether, on either chain.