We tried generating a quarterly 941 form for 2010Q4 today, and noted that the amounts that NS loaded in for the deposits/liability for the quarter were way off.  When we explored it, we found that the Payroll Liability Report was showing $0.00 line items for Federal Withholding, Social Security, and Medicare Withholding on individual paychecks, but when you look at the actual paycheck, it shows a non-zero amount withheld.  The issue is erratic - it happens for some paycheck line items and not others.

This certainly gives me pause before we go into creating W-2s and other year-end reports that depend on that stuff being accurate.  I've submitted a report to NS but thought I'd post here too to see if anyone else has noted this.