I have a new USB -1208 connected to new windows 1 1 computer running the latest DasyLab and Instacal, and channel 1 of the analog output stopped working. Channels 2,3 and 4 are outputting in response to a simple worksheet, but channel 1 just gives a steady 0.5v. I tried restarting, reconnecting USB, etc. Haven't re-installed Dasylab. What to do?