Rails - Apr 2013 - Extra characters rendered in view that cannot be found! A possible bug in rendering engine?

Hi
I have a very strange error when rendering the index view
Rails is rendering the characters *us* at the bottom of the screen, below 
an index table, and I cannot find these characters in the view.
This part of the view looks like
<section id="main">
<section id="group"></section>
<section id="content">
<section id="data_table_section">
<script>
us
</section>
</section>
The part from id=content is yield in a layout file
       <section id=''content''> 
       <%= yield %>
        </section>  
    </section>
When I delete the content of the view template, i.e the <section 
id="data_table_section"> <script> the *us* is still there
When I delete <%= yield %>  in the layout, the *us* disappears
When I search for the *us* in the view code it is not found
When I add my own extra characters in the bottom of the view template code, 
i.e after <script>  the *us* is displayed after these characters
When I delete the layout the *us* is still there
The only thing I can come up with is that us is generated by the yield 
function in some way, but that seems as a very strange explanation!

Anyone that has had this problem before?
Anyone that know how to find extra characters as us in the code ?
Could it be a bug in the rendering engine ?

Any advices would be great appreciated

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