QB Online was displaying non-taxable sales correctly when I pulled a November report on December 18.

Now in mid-January my December report is having the same issue described by original poster. Non-taxable sales are not reporting correctly.

Additionally, historical reports displaying online no longer show non-taxable sales that were correctly on reports printed at time of sales tax payment. 

Get your engineers to reinstate coding changed in the last month.  This is a major fault. Intuit is leaving itself liable for a major class action lawsuit and possible fines by state tax agencies.