The following are guidelines to help solve any problems you may have using this web site.
If you cannot find the answer you need please send us your question and
we will endeavor to answer it as quickly as possible.
An empty box, or a "Problem" message where the interactive animation should be.
If you are having problems with the calculus pages, see the Calculus section at the bottom of this page.
The most common reason for this is that the browser is very old.
The animations are written in HTML5, which was built into all current browsers a few years ago.
Some older browsers however are still in use, and are no longer being updated.
A common case is the Internet Explorer browser (IE) on Windows XP machines.
There is no version of IE that runs on XP that supports HTML5. The solution is to install either Firefox browser or the Google Chrome browser (recommended).
You can download Chrome from the Google site.
The symptom of this is a blank animation window.
so cannot be documented here. In some browsers it is labelled "Enable scripting".
The calculus pages have no animations
The calculus applets are written in Java, so the most likely cause is that the Java browser plugin is missing or disabled. There is a Java control panel that has the settings for this.
You can download Java from the Java site.
The calculus pages keep asking for a security confirmation before loading the Java animations.
The calculus applets are now the only applets on the site written in Java. With each release of the Java plug-ins, they have become more and more paranoid about security, to the point now where they ask for your OK every single time you load an applet.
The next time you go to a calculus page it will ask you one time to confirm, then never again for this site.
- First download the latest Java plug in. Version 7 update 51 or later is needed.
- Go to the Java control panel. Select the security tab
- At the bottom is a site exception list. Add to the list "www.mathopenref.com"