Please update your X-Rack and AWS if you have this issue. As of this writing AWS is on V5 (Delta Control).
X-Rack set to an address of A2 may not switch to saving TR when interfaced to AWS900 V1.2/11.
X-Rack address A1 and A3 function normally.
This bug is fixed in AWS V1.2/13 and higher.
The latest X-Rack and AWS software can be found in your account.