Many of you doing development on Vault 2015 R2 have noticed some issues with the SDK. For example, the What’s New page is for the 2015 release and there is no list of changes for 2015 R2.
Those issues should now be fixed. Sorry for the inconvenience. Please un-install your current Vault 2015 R2 SDK and install the fixed SDK: Vault_2015_R2_SDK-Fixed.zip
If you have questions about the Vault API, the best place to go is the Vault Customization discussion group.