Changes to the AR1010 FM receiver module?

Has anyone noticed any changes in more recent instances of the [AR1010 FM Receiver Module? I’m in the process of building a radio using the board, and had troubles with both of two modules from a recent shipment. Replacing them with a module ordered last December fixed the problem.

I’m using a very-slightly modified version of the example code in the product listing, and the seek / tune / power on complete flag (MASK_STC) in the status register never seems to get set (w/ the newer modules). The I2C communication between the microcontroller (ATmega168) and FM module seems to work, but the module can’t tune. Any ideas what might be happening?](FM Receiver Module - WRL-08770 - SparkFun Electronics)