Why Am I Having Difficulty Processing the 37 Listening Point?

37 is quickly processed and goes to Point 36.

However I am not able to locate the ref mic for Point 36! What's happening to cause  problem? 

My room is ~20x25 ft. with small listening area, with an active  2.1 system. I have speaker stands on both sides of my 7' desk, level with my head/mic. The front speakers (KALI IN-8 V2) are basically in free space, ie.e, no wall behind them. The Sub (down-firing) is to left (almost under the left speaker. SoundID Measure verifies the front speakers are ~ 8'2" apart with 4'7" distance from speaker to my listening location. All of the Measure steps proceed quickly with no errors, until Step 36. 

Any suggestions? 

Thanks, Billy