I'm Daniel from lotura.com. Our customer Sifra, ferreonline.es, included AddThis on product's page: http://www.ferreonline.es/productos/guante-silicona-lekue/p-3000-3002-1313222870-20/.
When you click on email icon, it opens a new layer, but "send" button is empty, it looks like a white rectangle. It must be "Enviar" in spanish.
Thank you in advance.
Your CSS is interfering with the display of the button. Try adding this to your CSS file to change it back:
color: #555 !important;
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