Blank Page After Search Or When Clicking on certain Categories?

Hi there, does anyone know why my search bar is just displaying a white page for results. This also occurs if you try to click on our 'Oils and Additives' category..... Blank White Page Occurs however if you try some of our other cats. they work correctly?

checkout our site: https://www.smallbikesni.co.uk

Cheers
John.

Zencart: 1.3.8a Patched

Yep i had the exact same issue recently .... the reason for this is an extra space after the closing ?> in a .php file!

Have you changed any files recently, if so have a quick in those for an extra blank line at the bottom of the file.

If you cant remember or not sure, here is a link to a debugging tool that helped me find my error....
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=860

Really simple to use, just remember to delete the file once finished.

Good luck