The Groundhog plugin is currently in beta. Additional functionality and fixes are forthcoming.
Support is offered — subject to availability — through this email address. When asking for support please ensure you provide an example Rhinoceros model, Grasshopper definition, and a detailed description of your problem in terms of what you are trying to do, what you expect to happen, and what is going wrong.
The preferred method of submitting bug reports and feature requests is through Github Issues. As with support enquiries, please ensure any bug reports provide an example model/definition along with a detailed description of your intended use and the resulting problem.