1. What’s the version of your IE 9, is it 32-bit or 64-bit? Note that Sharepoint 2013 with Internet Explorer 9 (64-bit)
is Supported with limitations as stated here
. Since the Chart is working as expected on other browser version I suggest that you refer to the Sharepoint community and ask what may cause the problem in their forums as this is more likely an issue with the webparts/Sharepoint 2013. I believe that they will support you properly on this.
2. I googled the issue you are experiencing. What is weird is that you state you haven't changed the hidden or visible properties of the webpart because such error will occur only in this situation.
What you can do to workaround the problem is to set the webpart's hidden property to true. You may give this sample here
the Telerik team