Yes this is an issue with the installer missing a file and adding two unneeded files.
To correct you’ll need to do the following on the server where Web Tracks is installed…
Delete ASPxRichEdit.skin and ASPxTreeList.skin from
C:\Program Files (x86)\Gritware\Web Tracks\WebRoot\App_Themes\Office365
Also overwrite the WebChartControl.skin file in the same folder with the one in the attached zip file.
This will be fixed in the next minor update. Sorry for any inconvenience.