The RED means that there is an error while checking out some element from the VCS server. When I saw the RED for a VCS status icon, I could fix this issue simply by **PULL** and **COMMIT**. When I **PULL**, I chose the remote between local and remote repository for the element needing to update from the VCS server to synchronize.
If you have a valid support user account and need any further assistance, please open a new support case at [Denodo Support Site](https://support.denodo.com) so that the support team can review this in detail.
Hope this helps!