As discussed, upgrade your smarter stats on your server to 4.0.3217. This release is built on the newest Silverlight patch, so no more pesky needing beta silverlight anymore. Download here: http://www.smartertools.com/SmarterStats/Download/V4.aspx
Then some users reported seeing blank on the area where graphs are supposed to be. If this is the case, uninstall silverlight -> go back to the smarter stats page -> click on the download silverlight -> download and install it -> restart the computer (to be safe, at mininum, restart browser) then it SHOULD work.
If not, my fix was to clear the cache by going to tools -> internet options -> delete all. The user above your post says it doesn't work, so reply if it doesn't and hopefully someone knows the fix beyond this.