Potentially Dangerous Request.Path Exception From Silverlight Object

I have a Silverlight object element embedded in a page in the usual way

<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="500px"> <param name="source" value="/app/ClientBin/appname.SilverLight.xap" />

Sin开发者_高级运维ce upgrading to Silverlight/.NET 4.0 this has been throwing intermittent exceptions

A potentially dangerous Request.Path value was detected from the client (:).

from the colon in the path name - the page url is given as

http://www ... /data:application/x-silverlight-2,

I know request validation is now enabled for all requests but why would this embedded object be treated as a separate request? Parts of the jQuery.js file have also shown up as separate requests and causing the same problem

http://www ... /,c.css(this[a],

either ways there is no visible impact on the user.