Why do my wallet transactions suddenly say invalid?
I see the same too. Can someone assist to explain!
I had to install the newest wallet. Install Stacks Wallet for Desktop
Quite annoying, the name switch.
Then also make sure you’re in mainnet mode, and that you download mainnet wallet (there’s 2) and you want 4.0.2 not 4.0.1.
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Thank you 
Just downloaded it. Is the attached image the right version of wallet you refer to? Is it the one ? 
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You’ve got it, Athena 
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Thanks heaps 