I am using logic pro for the RRS intensive and I have all of a sudden have 2 tracks that there is not volume and no waveform showing. I am seeing it show up on the graph in ProQ4 but I can not get any sound .I have researched and tried everything i could and there still is not output. Checked channel output, input, core audio, in and output and nothing seems off. Anyone ever run into this problem. It seemed to happen just all of a sudden. Any help would be appreciated.