What I understand from your post, is that you're having problems with the Virtual Remote Control.
In this case, as a first step I would recommend to hard reset the Slingbox and run the Setup Assistant from scratch.
Besides that, you can try to connect using a different browser (in case you're using the Web Based SlingPlayer). If the problem is still the same after that, check the IR Cable position and even try to select a different model during the Setup.
Also, I would recommend to try a different Audio and Video source as a last step, just to discard the current one as a potential issue.