Some users have been complaining about not being able to upload some of their images. They get the following error message: 

 

Not all users are reporting this problem, only a few.

 

We recently switched the uploader to the "IFrame" method and I was wondering if this problem is linked to the fact that we are nolonger using the Flash uploader? This is how we switched the uploader:

 

<ce:uploader id="InputFile" runat="server" UploadType="IFrame"></ce:uploader>

 

Notice the error message says the size of the current image is "undefined". What does that mean?