Like others, I found that ADP had "helpfully" obscured part of my SSN (despite it being shown in full in the upper-right corner of the form). In field "a" just above wages, mine showed "XXX-XX-1234" (the 1234 is standing in for my real four digits). Once I updated that to the full number, everything went through fine.
Although ADP is being a bit stupid here, TurboTax really should catch this and correct it.
