Bizarre Behavior of src attribute on img element in VS2008 inserting [A] characters

Question

With VS2008 SP1 I have a line of code like this in an aspx file:

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

This works perfectly. However, if I switch to "Design" mode in the IDE and then back to "Source" mode the characters [A] are magically/infuriatingly inserted into the beginning of the src attribute and I end up with:

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

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

Update: Actually it appears that this happens on every attempt to save the file.

Answer 1

I applied a hotfix from Microsoft and the problem went away:

IDE Serialization Hotfix