az5654, I can't believe it! I bought a HOS set a while ago, everything looked fine. Now I read your post and thought: this guy has bad luck with hairline cracks, good that my set has no such issues.
Next time I used the set I found a hairline crack in one of the ebony rooks.
Voodoo?
I know how it feels to receive a less than perfect set and it doesn't feel good so I can sympathize. I've noticed that several retailers have had problems with pieces cracking in the last few months. I'm not sure what the exact cause is. I suspect the extreme cold and dryness in most of the USA this winter didn't help. It's also possible the wood being used by one or more manufacturers lately hasn't been properly cured. Regardless the cause, wrangling with a supplier to complete an imperfect set certainly dampens the enthusiasm for that set.