I keep seeing this error over and over in the services-messages.log on the Primary server:

[DEBUG] [4/22/11 1:02:38 PM] [] [File Upload Servlet] [] [Invalid content type: null] [] []

Not having any luck with KB searches but maybe I've just been staring at this too long. Can anyone point me in the right direction to figure this one out. There's no GUID in the error message so I'm not sure how to determine what object is causing this.