Another Mackie XT/Sonar question

I'm using a Mackie control with 3 XTs under Sonar 4.03....been getting one annoying behavior: the REC button on the first channel of each of the XTs does absolutely nothing in Sonar. All the other REC buttons work fine, and it's not a hardware failure (all REC buttons work fine under SX).

Before I pursue this as a bug w/ Sonar, I just wanted to check and see if anyone else has this problem. I'm curious because my XTs are actually old Logic Control XT units that I've firmware upgraded to work as Mackie XTs....so maybe it has something to do with this?