PROBLEM Empty page after backend admin login

[retrofan]

When I login in the backend, I get an empty page:

After calling
> my-domain.org/admin
which asks for the login-data, after correct login the url redirects to:
> my-domain.org/admin/pages.php
and there is no content - just a clean white page.

Now I can type the following url:
> my-domain.org/admin/load.php?id=i18n_base
and everything works fine!

I reinstalled the whole page, all components are the latest versions, but this effect stays. How can I get rid of this crazy phenomena? I am searching since weeks to get rid of this issue. I would be really happy about a working hint!

Any advice?

--
These are my installed and active plugins:


Cookies plugin Version 1.3 
FlatBlue Version 1.1 
Google Map Version 2.0 
GS_Shortcodes Version 1.1 
I18N Base Version 3.3.1 
I18N Custom Fields Version 1.9.3 
I18N Version 3.3.1
I18N Search Version 2.13.1
Imagizer Version 1.3
Image Resizer Version 1.03
News Manager (updated) Version 3.3

[datiswous]

http://get-simple.info/wiki/debugging#wh..._no_output

[retrofan]

Thanks, for the quick reply!

The error output with debug-mode turned on is:

Warning: Cannot modify header information - headers already sent by (output started at /my_server_path/GetSimpleCMS/plugins/cbcookies/lang/de_DE.php:1) in /my_server_path/GetSimpleCMS/admin/inc/cookie_functions.php on line 23

Warning: Cannot modify header information - headers already sent by (output started at /my_server_path/GetSimpleCMS/plugins/cbcookies/lang/de_DE.php:1) in /my_server_path/GetSimpleCMS/admin/inc/cookie_functions.php on line 23

Warning: Cannot modify header information - headers already sent by (output started at /my_server_path/GetSimpleCMS/plugins/cbcookies/lang/de_DE.php:1) in /my_server_path/GetSimpleCMS/plugins/i18n_base/backend.class.php on line7

This doesn't tell me something... 
And when I call the other URL (also in debugmode) "http://www.my-domain.org/admin/load.php?id=i18n_base" the same warnings appear, but everything works fine. 

This problem ist just, the fact, that the backend does not appear wenn calling directly "/admin". What could it be?



!!! But !!! If I turn off the "cookies" plugin (http://get-simple.info/extend/plugin/coo...lugin/742/) the backend login works! Hmmm...

[shawn_a]

Make sure there is no whitespace before and after the php tags including newlines