Hmm, I have had some bows that were extremely difficult to turn the limb bolts on but never one that "stuck"...and now you have had two on the same bow. I would be interested to hear what the pro shop says. Just out of curiousity, did you loosen the lock down screw on the side of the limb pocket first before attempting to turn the limb bolt in and out?
Not accusing, just asking.