Signing with SignatureVersion2 does not work

[Carthaca]

When I try to communicate (f.i. DescribeInstances/DescribeSecurityGroups), the signature generated by elasticfox doesn't match the check-signature.

• cross checked with other tools, that work with my Endpoint:
  • http://fog.io
  • https://metacpan.org/pod/VM::EC2
• older versions of elasticfox work, too:
  • I tested https://aws.amazon.com/developertools/9302537431253167 with SignatureVersion1-signing
• how the signing should be done:
  • http://docs.aws.amazon.com/general/latest/gr/signature-version-2.html