difference in the level of "badness"
It would be Fatal (for me personally) if I paid for, say, 10,000 parts (of anything) before building and testing the first board.
On the other hand...
It's only mildly annoying if I study a schematic from a supposedly reliable source and find, through careful analysis, that there seems to be a problem with a particular part. A "Learning Opportunity," right?
I think it's always a Good Idea to ask other people if they perceive the same problem, as delkons did.
Bottom line: Trust but Verify.
Regards,
Dave