I tested it by adding a stat to the Leak Buster - Overall report. Restarted HoldemManager--> and the stat was still there.
Can you:
-1 Please update to the latest version -
http://www.holdemmanager.com/Downloads/HmUpdate.exe
-2 For W7 and Vista you must set \holdem manager\dbcontrolpanel.exe, holdemmanager.exe and hmhud.exe are started as administrator. Run the windows explorer and navigate to your Holdemmanager installation directory. Right click the executables and select properties... then select "Run as admin" from the compatibility tab. (or turn off Windows User Account Control completely and reboot)
(2) is the most important since it will give your account super user administrator privileges. So the changes you make to reports in HoldemManager can actually be saved.