Yea, IBD is only known to infect the boid family
and as for RTB's hanging out with their noses up in the air in the corner....mine tended to do that here and there...but she's perfectly healthy...i had her at the vet two weeks ago for a check up, and no signs of problems. Shortly after moving her to a larger tank, I put a shelf in her cage, and shortly after doing that i noticed she tended to hang out on the shelf sometimes, but i haven't really seen her "corner climbing" as i nick named it

personally with my snake i didn't see it as a health problem or a sign of IBD or a resp infection - because none of the other symptoms were there, but i had her checked out....all is well

If the RTB is in a small tank, that could be the reason, i've noticed alot of times RTBS tend to try to climb and hang up the walls in small enclosures