Sorry that didn't help you out! I compared your PayPal button code with one of mine and that is what I saw as the major difference!

I'm pretty sure that "sandbox" code should not be in a final operating form. But it is true; it should still do more than "refresh" your page!

Here is another questionable code compared to mine:
Mine: (<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="lc" value="US">
<input type="hidden" name="bn" value="PP-ShopCartBF">
</form></div> (<<Notice this is the end of my button code)
<div id="bv_" style="position:absolute;left:380px

Yours:
<input type="hidden" name="bn" value="PP-ShopCartBF">
</form></div> (<< should be the end of the button coding)
</form></div> (But this follows the end and may be "confusing the button action!)

Try editing that out of the code and see what happens. If it doesn't work...you can always re-copy the button to get back to this point. Just be sure not to "save" this page until you hit on what made it work!

You can "preview" any changes to see if the button works.

Another thought: That coding that I showed you where you have two incidences of</form></div> seems to indicate you have your PP button installed "inside" another form! But I really can't see the start of the other form!