More problems than what??? And what problems??? Its nothing I've ever heard of before, and is the complete opposite of what I'd expect if I were to consider logic, or applying physics to the scenario. If you're comparing to round lam boards for this myth, they were only used for an incredibly short period of time - and only by Fender AFAIK. Every other maker uses slab. So not only is there way too little info or statistical significance to most comparisons, but every maker of note has chosen to use, and continue using, the slab.