Unusual behavior of src attribute for img element in VS2008 inserting [A] characters

With VS2008 SP1, I have a line of code similar to this in my aspx file:

<img src='http://spiurl.appspot.com/<%#DataBinder.Eval(Container.DataItem, "UserName") %>' style='border:0; cursor:pointer;'/>

      

        
        
        
      

    

This works great. However, if I switch to Design mode in the IDE and then go back to Source mode, [A] characters are magically / enraged inserted at the beginning of the src attribute and I get

<img src='[A]http://spiurl.appspot.com/<%#DataBinder.Eval(Container.DataItem, "UserName") %>' style='border:0; cursor:pointer;'/>

      

        
        
        
      

    

... which is of course broken. Has anyone else seen this annoyance before? Do you have a solution?

Update: It actually seems like it happens every time you try to save the file.