Yes, we determined it was due to our iLogic code as well. Still happens on 2013, obviously, because that's what that piece of code does! Unfortunately, we don't wish to alter the code itself so we're stuck with either suppressing the rule during sketch edits (and hoping we don't forget to unsuppress it after) or just dealing with editing one dimension at a time...
Inventor 2013 Product Design Suite
Vault Professional 2013
Autodesk Inventor Certified Professional