weifu on "[Plugin: WooCommerce - excelling eCommerce] WooCommerce - Bulk Edit Price by Percentage - Error 404"

I'm using WooCommerce and I want to bulk edit price by percentage. However, I always ended up with a Error 404 page. This is the URL after I click on the Update button. (broken after & for readability):

(rootdomain)/(wordpressfolder)/wp-admin/edit.php?s=&
post_status=all&
post_type=product&
_wpnonce=0a7e537be6&
_wp_http_referer=%2Ftiffanylamps%2Fwp-admin%2Fedit.php%3Fpost_type%3Dproduct%26paged%3D1&
action=edit&
m=0&
product_cat=&
product_type=&
product_subtype=&
paged=1&
mode=list&
tax_input%5Bproduct_cat%5D%5B%5D=0&
tax_input%5Bproduct_shipping_class%5D%5B%5D=0&
comment_status=&
_status=-1&
tax_input%5Bproduct_tag%5D=&
change_regular_price=2&
_regular_price=30%25&
change_sale_price=&
_sale_price=&
change_weight=&
_weight=&
change_dimensions=&
_length=&
_width=&
_height=&
_visibility=&
_featured=&
_stock_status=&
woocommerce_bulk_edit_nonce=2d116e29fd&
bulk_edit=Update&
post_view=list&
screen=edit-product&
post%5B%5D=89&
post%5B%5D=85&
post%5B%5D=58&
action2=-1

No other errors have occurred.

I used to get Warning: require(./wp-blog-header.php) [function.require]: failed to open stream: No such file or directory in /home/(rootdomain)/public_html/index.php on line 17 when I tried the bulk edit price by fixed amount.

After I changed the index.php from ./wp-blog-header.php to ./(wordpress)/wp-blog-header.php I can now bulk edit price by fixed amount.

However, when I try bulk edit price by percentage, I get 404 error.

I've then tried bulk edit everything else including stock level, weight, etc. and it worked fine.

So far, I have not encountered any other issue with regard to WooCommerce. I only run into trouble when I try to change price by percentage.

I'm using the Mystile theme.

I have 2 wordpress folder installed on my domain.

Thanks.

http://wordpress.org/extend/plugins/woocommerce/