Can't recreate it. I tried sending with 0.001mBTC fee but it just get broadcasted successfully. Can you post the unsigned(!!!) transaction hex? To do that, enable "view transaction before signing" and save the transaction without signing(!!!). Then it'll save a .txn file with the raw hex inside.
To make sure: Don't sign the transaction.
Also I'm sure you know this already but people will be able to see all addresses in that transaction.
You've lost me, I don't see an option to enable "view transaction before signing".
At any rate, this problem hasn't occurred since.... very strange.
If it's gone then I guess it's good
. Though I still am curious of what caused it.
That option is listed under Tools > Preferences. It's been there for a long time. Enabling it will allow you to double check your transaction instead of getting it signed and broadcasted instantly once you click send and enter your password.