If you still have this problem here it is how i solved it:
in File: /modules/Product_Options/func.js
change from
Code:
/* Update price */
if (document.getElementById('product_price'))
document.getElementById('product_price').innerHTML=currency_symbol+price_format(price);
to
Code:
/* Update price */
if (document.getElementById('product_price'))
document.getElementById('product_price').innerHTML = price_format(price)+currency_symbol;