I noticed that a few people have already mentioned something like this, but no thread that I've read has given enough specifics for me to be sure that the problem they are describing matches mine.
In the View Stats section, when I run the Overview report for cash games, I get incorrect data in the summary data in the left upper section of the interface (graph is also incorrect). However, the bottom half of the report, when I look at the data by session, does show the correct data. The screenshot attached here shows the discrepancy between the two sections of the interface.
Note that if I view the bottom section by any other stat (date, stake or by position), the incorrect data is displayed.