Problem / Summary
Helm does not show any bandwidth data for sites which are known to have ued bandwidth. Also log files are in the format of (for example) u_ex040823.log instead of ex040823.log. This occurs when using IIS6.0.
Helm is unable to read the log files because they are being created in UTF-8 formate hence the u_ prefix. You need to turn this off in IIS.
Launch the IIS MMC then right-click on the name of your server in the left hand pane and choose Properties.
Uncheck the box that states "Create log files using UTF-8" and Save. You will need to restart IIS.
These changes will only take effect on newly created log files.