Originally Posted by
jbonamici
makes it seem to me like an insufficient chain wrap issue, as USAZorro points out.
Could be: hard to diagnose without the bike in front of us. If so, I'd make the chain just long enough to handle the big/big combo, though of course you'd never ride there...
Also, with a misaligned dropout hanger I'd suspect the problem would be magnified on the smaller cogs.