You didnt mention your Roku model # or firmware version (Settings/System/About) or app version (highlight the app and press Options (*) on the remote).
You also didnt mention your specific issue with HGTV Go
Try reinstalling the app, and checking if that addresses the issue:
1) Remove the HGTV Go app (Highlight the app, press the Options (*) button on the remote, then Remove)
2) RESTART the Roku (Settings/System/System restart/Restart) <-- MUST DO THIS HERE!!!
3) Re-install the HGTV Go app
(Otherwise, if you dont restart settings/cached data associated with the app are left behind and it wont be a clean re-install)
