Drupal 6.x

When I go to /user or /user/register my page gives me a 404, does anybody know why this could happen?

Here is a few tidbits about my page that people talk about when they have similar issues:
1.) If I clear cache everything works for a bit, but eventually it breaks again
2.) I am using clean urls, adding ?q= does not help
3.) I have .htaccess in my root, but not sure if it is setup correctly
4.) I have a base_url in my settings.php file

I am using Drupal 6.x

Thanks in advance for any help.

Hello everyone. I am having a problem with my gallery only showing the images if I log into the site and go to the gallery page. If I log out of the administration side the link to the gallery is still there and I can navigate to it but the images aren't visible. I have even tried installing different gallery modules and they do the same thing. Has anyone come across this problem and have any suggestions on how to fix it? I fairly new to Drupal.

• Advisory ID: DRUPAL-SA-CONTRIB-2015-029
• Project: Corner (third-party module)
• Version: 6.x
• Date: 2015-January-21
• Security risk: 13/25 ( Moderately Critical) AC:Basic/A:None/CI:None/II:Some/E:Theoretical/TD:All
• Vulnerability: Cross Site Request Forgery

• Advisory ID: DRUPAL-SA-CONTRIB-2015-028
• Project: Shibboleth authentication (third-party module)
• Version: 6.x, 7.x
• Date: 2015-January-21
• Security risk: 13/25 ( Moderately Critical) AC:Basic/A:None/CI:None/II:Some/E:Theoretical/TD:All
• Vulnerability: Cross Site Request Forgery

• Advisory ID: DRUPAL-SA-CONTRIB-2015-026
• Project: Taxonews (third-party module)
• Version: 6.x, 7.x
• Date: 2015-January-21
• Security risk: 13/25 ( Moderately Critical) AC:Basic/A:Admin/CI:Some/II:Some/E:Theoretical/TD:All
• Vulnerability: Cross Site Scripting

I'm doing a site search and i have one problem, the search returns me all types.

I need not be listed certain types and use "preprocess_search_result"

i use drupal 6

there is a solution ?