White Pages from some menu's

I was just finishing off my first shop and somewhere along the line a problem has sneaked in. When I login and enter my username and password I get a white page when I OK. I refresh the page a couple of times without success but when I click the browser back it sees them as pages, so it is sending blank pages. When I click on the second category Gift Certificates I get the same also when I click my account I get the same. I had a couple of backups but they are all the same.
I thought it might be an issue with the horizontal css menu but it does it from the login top left.
This is my site http://eden-chocolates.co.uk/index.php?main_page=login
I transferred the same INCLUDE files to my test site http://v-twinuk.com/index.php this has no problems at all.
Based on this test it looks to me like its either a file that's bad on my Eden site, that is not in my INCLUDE files, or a problem with the database.

Thought I was almost done now this. Can anyone help?
Cheers
Steve

Install and run this and post the log results:
**
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=860**

Thanks for the help
This is when it fails on the gifts category
[11-Sep-2009 14:30:55] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tresp/public_html/eden-chocolates.co.uk/includes/languages/english.php:1401) in /home/tresp/public_html/eden-chocolates.co.uk/includes/init_includes/init_templates.php on line 78
[11-Sep-2009 14:30:55] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tresp/public_html/eden-chocolates.co.uk/includes/languages/english.php:1401) in /home/tresp/public_html/eden-chocolates.co.uk/includes/functions/functions_general.php on line 44
[11-Sep-2009 14:30:50] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tresp/public_html/eden-chocolates.co.uk/includes/languages/english.php:1401) in /home/tresp/public_html/eden-chocolates.co.uk/includes/init_includes/init_templates.php on line 78

This when I try and log in
[11-Sep-2009 14:34:17] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tresp/public_html/eden-chocolates.co.uk/includes/languages/english.php:1401) in /home/tresp/public_html/eden-chocolates.co.uk/includes/init_includes/init_templates.php on line 78
[11-Sep-2009 14:34:17] PHP Warning: session_regenerate_id() [<a href='function.session-regenerate-id'>function.session-regenerate-id</a>]: Cannot regenerate session id - headers already sent in /home/tresp/public_html/eden-chocolates.co.uk/includes/functions/sessions.php on line 167
[11-Sep-2009 14:34:17] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tresp/public_html/eden-chocolates.co.uk/includes/languages/english.php:1401) in /home/tresp/public_html/eden-chocolates.co.uk/includes/functions/functions_general.php on line 44
[11-Sep-2009 14:34:05] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tresp/public_html/eden-chocolates.co.uk/includes/languages/english.php:1401) in /home/tresp/public_html/eden-chocolates.co.uk/includes/init_includes/init_templates.php on line 78
[11-Sep-2009 14:34:02] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tresp/public_html/eden-chocolates.co.uk/includes/languages/english.php:1401) in /home/tresp/public_html/eden-chocolates.co.uk/includes/init_includes/init_templates.php on line 78

Its working. I opened the english.php and found a space after the last >. I read somewhere that spaces were bad. Is far as I can see its all good, can you see anything else with the log?
Thanks very much for your help with this.

That's pretty much what the log says. When you see the line number 1401 in english.php (which has ~700 lines), it usually means there's a blank space or line after the closing PHP tag.

Thats great, back on track. Thanks again for your help.