[ChickenLiver]

Sounds like a bug to me. I'll look into it later the week, when I have a chance.

Edit: Until then, you can bind the guitar buttons on the non-guitar screen if you want. There's a post somewhere on this forum (PS2 plugins forum) with a list of how to bind things for Rockband (Not the Guitar Hero 2 binding info in the main forum, even if you're playing GH2). You could also download the last test version in that thread, which I don't believe locks the checkbox.

Locking the "allow binding axes to buttons" setting is because on the Xbox 360 guitar, tilt is an axis, while it's a button the PS2 guitars, and I didn't want people repeatedly asking about it. Sick of people asking about pressing the bind axis button to bind analog sticks and d-pads, and didn't want to create another issue that'd result in tons of repetitive questions. Just letting the user disable it would get around the issue you're running into, but sounds like there's a bug involved, too, which would be best to fix.