Hello, I have the following DTV receivers: HD-DVR DIRECTV HR20-700 HD DIRECTV H21-200 Standard DIRECTV D12-300 Standard DIRECTV D12-100 Standard DIRECTV D12-100 HD-DVR DIRECTV HR21-100 I'm not able to watch live TV while recording a program at the same time with the HR21-100. This is a new receiver that we began using in July. The HR20-700 has always been able to record and watch live TV at the same time since we started with DTV in Jan. 2010. I have a Slimline dish with a SWiM (not sure what exactly it means or how it all works). Anybody know why I can't record and watch live TV with the HR21-100? I receive a message stating: "In order to tune to ---, you must stopone of the activities below> Stop Recording or Cancel Request." Is it not possible with two HD-DVR receivers? Any help would be grateful.