It was when running a custom fusion report. If I had included a line in my report for consumer spending on lunch at a fast food restaurant (X1133_A), that line used to be blank when I ran the report because that variable wasn't part of the BA Basic license. But the rest of the report would still run. Now, it seems that the report won't even run if you have a report that includes a variable that you haven't licensed. It just gives you an error message. So I thought maybe something was wrong with my license.
But really, it's no big deal. Now that I've found the full list of variables which are included with the BA Basic license, I have a better idea of what I can & can't include in my custom fusion reports. If I make sure to stick with variables that are included with the Basic license, the fusion report runs just fine.
For anybody else who runs into this situation, the list of variables that are included with each license can be found in the document called 2013 BA Desktop Variable and Report List.xlsx which gets installed in the following folder: ArcGIS\Business Analyst\US_2013\Documentation