If you use Virtuemart 2.0, this problem comes from Virtuemart.
The reason comes from the format of some php file is UTF8-BOM.
The solution is open the file by some editor (I like to use Notepad++) and choose the new format is "UTF8 no BOM" or "UTF8 without BOM" then save it.
Those file are:
modules/mod_virtuemart_product/mod_virtuemart_product.php
administrator/components/com_virtuemart/tables/products.php
administrator/components/com_virtuemart/tables/categories.php
and many other files but you may do with above files to solve the problem.
If you need to send us FTP access / host access, administrator access or any private information:
services(at)omegatheme(dot)com or drop a ticket
www.omegatheme.com/member/
unwanted space
