Drupal 6.x

Can anyone suggest why a Drupal site will suddenly serve up nothing but the main page?

It will not accept logins (the password is right, I reset it via mysql to be sure). No error message, no access denied, the main page just reloads.
It won't send password reset (mail does work, I sent myself a test mail).

There are only a few links on the site; they all just result in the main page reloading.

Typical log entry:

x.x.x.x - - [01/Aug/2013:14:52:20 -0700] "GET /user HTTP/1.1" 200 5495 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:22.0) Gecko/20100101 Firefox/22.0"
x.x.x.x - - [01/Aug/2013:14:52:34 -0700] "POST /front?destination=node%2F1 HTTP/1.1" 200 5495 "http://mysite.com/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.79 Safari/537.4"

Error log shows nothing helpful (just shows the last apache restart).

I tried hardwiring $cookie_domain in settings.php but it didn't help.

It was working OK a few weeks ago - then I didn't use it for a while. Haven't changed anything at the Drupal level.
This is only a test site so I can just tear it down & rebuild it, but I wonder what happened.
Wise words welcomed.

To follow up:
- cleanURLs are enabled but they don't work either - for instance:
mysite.com?q=user takes me to the front page
- cache emptied, no help
- stock .htaccess in place

Has anyone else experienced this? For instance, this link: http://ht.ly/mnhvx ; it loads fine but if you check the title bar, it says 'Access Denied.'

When I go to the actual url, it's fine: http://lifetrac.ca/blog/am-i-easily-influenced

I have copied a website successfully to my local WAMP server, but I noticed the the Notification modules are not sending emails. This is might normally be due to the fact that my computer is not running an SMTP server. I did a lot of settings to the Apache and PHP.ini but nothing has worked, all I get is "Message sending failed"

If I use URL:

http://weightconcern.org.uk/node/302

The URLS at the bottom of this page are correct:

e.g. "About the author" goes to: http://weightconcern.org.uk/node/303

If I use URL alias:

http://weightconcern.org.uk/tinytastes

The URLs at bottom of the page are wrong:

Hi there,

There were some files that went missing in drupal and I have a drupal core issue when it interfaces with siteminder module (to help with authentication of users already in a system). The drupal site has a fatal php error and I can't find it so I'd like to re-install drupal and then re-add all the modules I wrote for handling content etc.

I'd like to remove all the previously stored data in the database, remove everything that links back to the old drupal. When I added a new downloaded drupal to the site (kept the sites folder), all the old data is still there (probably from the database). So I'd like to remove all the tables drupal created in the database and reinstall drupal so that I can basically re-construct everything from scratch. I've saved the old drupal so i have all the themes and modules, I also downloaded any of the tab i created in the database so i can put them back.

I need help doing this install because i seem to get locked out of both phpmyadmin and drupal if i just go ahead and delete the files and replace them with the new and updated versions in the folder that holds content on the server.

Any direction would be really helpful. I could even talk with someone via ph if you are free and have this sudden urge to help someone for a not apparently good reason.

synthesis
which is better solution for change the order in a view result?
the order isn't a simple asc or desc but must dependig by some field values

I thinked at two solutions:
1)
change or override directly the sql, but how?

2)
I suppose that the db query result is insert inner a php array;
so instead of change the sql I can change directly this php array, but how?