This is an old revision of the document!
CommandFusion iViewer can communicate with Crestron processors in a variety of ways:
Documentation for each method is available on their respective GitHub repositories.
Each method has pros and cons, which have been discussed quite frequently on the CommandFusion Software Google Group.
In Summary:
Firstly, make sure you are using the latest version of iViewer 4 (not CF iViewer). If the problem persists - contact us via one of the options on our support page.