Error message suddenly when downloading CSVs from Monthly Statements page

[stitcheswithcats]

I get this when I hit "Generate CSV". It happened suddenly - I had downloaded 3 then this. I tried clearing my cache, etc, but no luck. 

It's a long string of HTML with "the request signature we calculated does not match the signature you provided. Check your Google secret key and signing method."

[Kameragurte]

Same here! Did you get any help or have did you find a solution or workaround for this?

Help is much appreciated