If you have previously used variables in prior year releases, check the ACS product changes webpage for source table changes. If the variable you have been using comes from a table that has changed from the prior year, check the variables list (variables.html) and compare the variable concept and label to be sure you are requesting the correct estimate. For information on these changes, visit:
Use this Data Profile Variable Comparison table to check if your Data Profile variable has changed from 2014 to 2015: