“fail to broadcast action. The action failed to be broadcast to the network Suggested actions invalid IoTeX address."

[HelloNigel-update]

Hi,
Having a repeated problem with ioPay Desktop v 1.0.16. the wallet shows the balance but when I try to send or swap, I get “fail to broadcast action. The action failed to be broadcast to the network"
and "Suggested actions invalid IoTeX address."
I've been trying to send to an IoTeX address in Binance and now I've just set up another IoPay Desktop wallet - same v 1.0.16 to generate a new address to try to send it there, and got the same "fail to broadcast... result
Looks like my IOTX is frozen.
Can anyone help??