I am learning "whatever I believe in, or cling to, makes me unavailable to hear anything new." This can apply even to how I work this "simple program." (Or in how it "works me.")
Once I find the program works to create more peace of mind, I can become very gung-ho and want to share it with all kinds of people who I think need it. I know I am really attached when my mind closes to their objections and I try to over-ride their truth.
Or it can be more subtle. Suddenly I discover I have so much attachment to a particular method of doing the program, that I may not be comfortable with any questioning of the program, that threatens "my" understanding of it. I get angry or defensive or accuse someone of creating chaos, not "doing" program the way I learned to do it from an old-timer in my forum or group.
Just as in any Spiritual journey, there comes a point where my particular faith practice is tested. And so, Step Twelve becomes Step One, again.