Getting 'The AWS Access Key Id you provided does not exist in our records' error with Amazon MWS

I upgraded from one version of Amazon MWS (marketplace web service) version

https://mws.amazonservices.com/Orders/2011-01-01

to

https://mws.amazonservices.com/Orders/2013-09-01

and started getting the following error:

The AWS Access Key Id you provided does not exist in our records.

The keys are all correct and double checked.

 

===================================

Someone at Amazon decided to change the order of parameters for some reason...

IMarketplaceWebServiceOrders service = new MarketplaceWebServiceOrdersClient(                  applicationName,                  applicationVersion,                  accessKeyId,                  secretAccessKey,                  config);

to

MarketplaceWebServiceOrders service = new MarketplaceWebServiceOrdersClient(                  accessKeyId,                  secretAccessKey,                  applicationName,                  applicationVersion,                  config);

So obviously it compiles but fails.

Just switch them and it will work. Hopefully they didn't switch anything else important like this in the API.