Honestly, I quit using the tool shortly after installing (this was right after launch) because I could not view the data and the tool was pretty worthless to me. As I remember, about a week ago I opened the editor again and it promted me to download an update and to my surprise, it actually provided me with the performance data!
I just checked and it looks like I still have version 1.0. Perhaps if you download and reinstall the software it will work, but I can't say for sure.
Here is a link to the adcenter desktop support center https://support.adcenter.msn.com/default.aspx?productkey=adcenterdesktop&mkt=en-us&scrx=1
[edited by: MadeWillis at 3:09 pm (utc) on Sep. 29, 2008]