Sorry about that - just saw the posting guidelines and will follow next time. I figured out the problem, and am posting it in case other newbies run into something similar.
I have three different data sources to the same excel file to filter the data in various ways. This was the easiest way I found to get trend lines for subsets of the data, for example. For the particular sheet in question, I must have accidentally selected the primary connection, dragged a measure to the column shelf, then selected the secondary connection I intended to be working with to create the bins dimension for the row shelf. This generated an error:
I followed the instruction in the message by clicking on a broken blue link in the dimensions pane, but that didn't fix it (link is red in below pic). The indication of that there is still a problem is shown with the red circle by Payroll 60M to 100M (secondary connection) and a blue circle with white checkmark over BaseballSalariesPerfor... (primary connection).
After removing the field from the primary connection off the shelf and selecting the secondary connection to create the bins, the stacked bar chart I was after displayed just fine.