Using IE developer tools I can see that line 1720 of bp’s default.css uses a filter that starts as white ( #ffffff ). If this line is turned off then the white text of the add to cart button can be seen.
It can also be seen that Woocommerce colours this text white though I can’t tell you the line it’s on.
Using Firebug with firefox it seems that woocommerce colours the button background with it’s own ‘mozilla’ only gradient which seems missing from the ie version
This should be fixable by adding to the child theme style sheet
Try using Firebug with Firefox, or use the developer tools in Chrome, Safari and IE, or Opera Dragonfly to see for yourself.
