Post installation

I've been having a problem with my Drupal site that pops up about once a day that I'm wondering if anyone else has had and can point me in a direction to solve.

What happens is the site, rather than loading, comes up with the message "opendir(hm/profiles/standard/modules/pathauto/../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../.. in /usr/hm/DRUPAL-4-6-3/webroot/includes/file.inc on line 538." repeated over and over on the page.

This generally only affects the site for a couple minutes at a time (and shows up with that error message in my admin log about a hundred times), but I'm wondering if I can do anything to stop this reoccurrence.

I am getting this error every time I post or update something:

user error: Duplicate entry '15-281' for key 1
query: INSERT INTO term_node (nid, tid) VALUES (281, 15) in /home/httpd/vhosts/techvillage.com/httpdocs/includes/database.mysql.inc on line 66.

I found the following postings, but nowhere does it say how to fix the problem:

http://drupal.org/node/20294
http://drupal.org/node/20262

I've read the handbook and searched the forums and searched the internet. As I understand it, mail should just work and if it doesn't it's a problem with php.ini.

I'm working with Vendhost. I don't have a primary copy of php.ini from them yet to create the custom copy I'll use in 'public_html'.

What am I looking for once I get it? Where can I read the code Drupal uses to make a mail call? What am I adjusting in php.ini to give Drupal what it needs?

Is there a comprehensive explanation of the mail function in Drupal I can read? I've not found one.

Finally got massmailer working and now it's glitchy.

Using CivicSpace 0.8.3 which is using Drupal 4.6.6
Using massmailer v1.34
phplist v.1.9

I have the following line in my massmailer "settings" (admin/settings/massmailer)

To unsubscribe follow this link:  http://www.mysite.com/[unsubscribe]

When I create a mail with a message type = hybrid/html and text

and the single word "test" this is what I get in a mail

Hi I just installed Drupal last night and am unsure how to get content on my navigation. Can someone please give me a quick step by step guide? If coding is neccessary can someone recommend me a simpler alternative?

Thanks,
GreenHat1010

I feel most clueless. I want to have several sites hosted from one drupal installation. So, I have set up the new sites, each with its own setup, as in

sites
   mysite.com.foo
      settings.php sets base URL to http://mysite.com/foo
      themes
         foo_specialtheme
   mysite.com.bar
      settings.php sets base URL to http://mysite.com/bar
      themes
         bar_specialtheme

But, if I try to go to http://mysite.com/bar, for instance, all I get is a "page not found". If I add a page and give it the short url "bar", that's fine, but what is my equivalent, then, of promoting to the front page? If I try to add a special theme to that location, when I go to administer themes, I see only the general themes, not the one in the themes folder for that folder.

What might I be doing wrong? Is there more settup that I am missing?