Hi Will,
The problem may be quite minimal due to the dryness, age of the bark/shavings and that the crickets live in them and not the cham
However, if you read the article that Eve posted and the link to Kaplan's next article specifically on pine (first article is on cedar) you will see that most toxic effect is internal and that the jury was still out in 1994 (her articles are old, but her research is excellent - she is a trusted source of info).
I know about the waxworms being shipped in pine shavings, but they don't breed or live in them (at least not very long) and they don't eat them whereas a cricket might (they eat just about anything!)
Pine and cedar are in the same family (conifer/cone producing) and are both resin producing trees and resins contain phenols, volatile oils, etc.
I don't mean to make a big deal out of it, but since there is no definitive answer on its toxicity level I just want anyone new to this (e.g. waspinator) to be aware of the potential hazard in using any. I hate that the reptile industry still sells this stuff, but they sell calci-sand, too ;-/
If you crush your shavings and have absolutely no smell you are probably OK. Hey, it just occurred to me - I wonder how dry coco-fiber would work? I mix that with the peat for my roache to help retain moisture, but used dry as cricket substrate may be a good idea. B/c the pieces are small and thin the frass would have less chance to stick and would likely fall away to the bottom. As for my crix, they are on pc or nothing - with lots of egg cartons to hide and cruise around on, but I might just experiment with the coco-fiber. 
lele
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