Plugins Not Responding in Master Channel Strip

[Cayce]

I'm trying to place some inserts in my Master channel—EQ, Compression, etc—but nothing I put in there shows any activity or response. For instance, the stock compressor shows nothing in the input meter when the signal comes through. When I place the same insert in my Sub Mix channel, it works as it should.

What am I missing?

Thanks.

[Bookerv12]

What output pair is your master controlling?

[Cayce]

If I'm understanding the question, my Master output is to 1 & 2.