Karl, THIS MIGHT BE IT: Make sure your QMX is set to VFO A before performing the RF sweeps. If it's set to VFO B, the RF Sweep doesn't work right and shows graphs like you posted. Yeah, I just had mine set to VFO B and performed RF Sweeps and got crummy graphs like yours. Switched to VFO A, and back to my beautiful graphs. Hopefully this is the fix for you!