Tim, when you say it was distorting, were you getting a message on the K PA telling you that the signal is too hot?
No, but I knew there was a problem when I couldn't make a clean profile, every time I tried to make a clean profile it came out distorted. Then when I switched to the 1/4" the clean profiles came out clean as they should.
That might be a good way to test this idea with your setup, see if you can make a clean profile. When you select clean amp during the profiling process if the Kemper detects distortion it will tell you that you just profiled a distorted amp after the profiling process, that what it was doing to me, and when I played the profile it was indeed distorted (yet the amp was perfectly clean).