When I make a grouped bar graph with Prism 4, it puts labels under the X axis for each individual bar. I want to label groups of bars.

Prism 3 (and earlier) labeled grouped or separated bar graphs with labels for each group (duplicating the legend). Prism 4 fixed this bug (in our opinion) and instead put labels under each individual bar, using the row titles. Some people prefer group labels and release 4.02 and 4.0b let you choose (in the Format Axes dialog, X axis tab).