It may well be a glitch but what the email is telling you is that because TurboTax doesn't support Schedule L balance sheets on 1120-S forms, which is where Accumulated Amortization is reported, they aren't going to look into it.
Accumulated Amortization actually is complex, and not something that many TurboTax users will have, so they're not going to address it, that's the bottom line it sounds like, unfortunately.
