Empty Scan, black jpgs

I'm trying to get a Ciclop based scanner working with FabScanPi. I was able to run the calibration - it completed without any error reports. However, when I try to scan something I get 3 .plt files, (0, 1, both) without any error reports. The 3 files have nothing in them but the plt header. If I look at the .jpg files in raw_laser_raw they are all totally black. This has happened with each thing I have tried to scan. Any hints on where I should try next?