If the bug was in the Server (and so it seems, because of the IE8 and .js in the description) you only need to delete the Server installation, and reinstall the latest version, SR4 of version 10 in this case. Server installer is in the Download page as a different download. If you don't have access to the .exe file, you will have to contact your QlikView partner or sales rep.
That will apply the fix to the Server. If you see that it keeps behaving unexpectedly, contact supportES@qlik.com.
Hope that helps.