In late 2014, the battery frame in the ULX-D1 was changed. Please provide details.
To improve the quality, reliability and durability of the ULXD1, Shure instituted a new battery frame design that was first employed with QLX-D. The new frame eliminates potential battery contact issues when using AA Alkaline cells.
Note that the SB900 rechargeable battery does not have contact issues.
To determine if a ULX-D1 has the new frame, look for the label inside the battery compartment. Printed above the word "Mexico", there will be the letter "F" (for Frame).
When using AA cells with an older ULX-D1 without the new frame, use the battery cradle accessory that was supplied with transmitter.