[laser188139]

This may be a sound card driver issue. I see behavior like this on an XP system with Soundblaster SB Live. If I go into Control Panel -> Sounds and bring up the Sound control, under either Sound or Voice I click on the Volume button under Record, I see a choice of Mic, Line In, and S/PDIF in. If I click away from Line In to Mic and back to Line In, REW can again see the sound input.

Bill