The problem with using this hook is that it fires on every page front and back. In the case of the site linked to your profile which I assume is the site in question here I see 5 external files which should not be there.
The plugins doing this are simple modal contact form and wp-photo-album plus.
Hi Seacoast, I just did as you suggested and nope, still not working. I had that suspicion because I have used the same theme and same plugins on another site and all worked ok there.
Please repeat the steps necessary to fix your issue. If you had followed Seacost's advice you would have seen that 1 of the plugins I mentioned was the cause.
Please disable or delete ALL plugins and switch to the default theme (TwentyEleven since 3.3). After making these changes does the problem still occur? If no, re-enable everything one by one to see which component causes the problem.