Signature for this request is not valid.

[45by90]

Hello,

As of this morning, I'm unexpectedly receiving:

APIError(code=-1022): Signature for this request is not valid.

When trying to place a trade. Anyone else seeing this, or ideas as to the cause? It had been working, though I had to refresh my key, but I can't see what else would've changed.

Thank you,

John