Input Trouble Sonar X1 using Tascam US-1800

Hello,
     I had just encountered a problem setting the inputs from Tascam 1800 to the audio tracks in Sonar. For example, track 1 is inserted and I would try to set the input from Tascam to that specific input. Tascam is recognized and says I have 8 inputs to apply but once i scroll to the drop down to set it, nothing appears. If anyone could assist me and help me solve this, it would be greatly appreciated. Thank you.