I use LetterHead themes and got the same problem.
I solved it already by deleting the google.txt.
Just currious, I try to find out what makes it happen and the answer is google advertising.
Google.txt is needed to call the google advertising at here’s the code of it :
<div id=”google”>
<script type=”text/javascript”><!–
google_ad_client = “pub-0437481905431095”;
google_ad_width = 120;
google_ad_height = 600;
google_ad_format = “120x600_as”;
google_ad_channel =””;
google_color_border = “000000”;
google_color_bg = “FFFF7F”;
google_color_link = “0000FF”;
google_color_url = “008000”;
google_color_text = “000000”;
//–></script>
<script type=”text/javascript”
src=”https://pagead2.googlesyndication.com/pagead/show_ads.js”>
</script>
</div>
