Originally Posted by
martslc
My chain is catching on the large front chain-ring sometimes instead of shifting to the small ring. It catches on the bottom teeth as shown.

Trying to figure out what this means. To me, it seems like you're saying:
I'm cruising along in my middle ring and when I get to a hill I go to shift into the small ring but my chain wants to shift into the big ring instead.
If that's right, I guess the first thing I'd do is look to see if the big ring is straight.
Which cog are you in when you notice this?