Resource interpreted as Script but...

I'm trying to configure liveperson for a website. I add the LivePerson Monitor code just below the body tag (and tried in several other places as well), but the livechat sticky buttons do not show up and I have the following error in the browser console:

Resource interpreted as Script but transferred with MIME type text/plain: "http://server.iad.liveperson.net/hc/s-29042742/?cmd=lpTagGetJsSnippets".

Any ideas what might cause this? You can see the same error at www.beeoptions.com.

Thanks!