Drupal 7.x

I've just upgraded a 6.22 site to 7.0 running on ubuntu LTS Hardy Heron. Everything works fine, except that when I edit a page I get the following errors:

Notice: Undefined index: description in field_multiple_value_form() (line 155 of /var/www/drupal-7.2/modules/field/field.form.inc).
Notice: Undefined index: required in field_multiple_value_form() (line 177 of /var/www/drupal-7.2/modules/field/field.form.inc).
Notice: Undefined index: required in field_multiple_value_form() (line 206 of /var/www/drupal-7.2/modules/field/field.form.inc).

Is it possible to make sure that the user is logged out after a period of inactivity?

If so, where do I find this setting?

Hey, I'm new to Drupal and have been facing one minor set back after completing like 90% of my site. i really dont know what i've done but in my Main menu i've added links to create new forums/poll questions/articles and have given permission to only authorized users who register with the site. However everything was working fine until yesterday when i was messing around with the groups settings (still cant figure out how to make groups) and then when i logged in as a user and tried to create a forum topic i got the access denied, you are not authorized to access this page message.

Hi there!

I'm creating my first theme here, for a customer.
I've struggled some time with the menu system now, because of the "large" customizations I'm trying to do.

What I need is to collect each main-menu item's children to create a seperate dropdown.
Not a regular based of unordered lists so I easily could've used modules like Nice Menu and Superfish. I need to manipulate the HTML just of the children.

Hi,

I'm looking to create 2 templates. One for a normal screen and another one for mobile devises.

What kind of template can I use? I've been looking on fusion, but fusion mobile and mobile tools (even skinr) are in development.
Is it a good idea to work with those modules if I need a mobile version?
Do you know others modules?

Thank you for your answer

I am trying to make registration system. There is different events shown in calendar (which are categorized by type: seminar, theater etc.) and person can register himself to that by submitting webform. Webform sends email to person who registerd and also to event type admin(This is already OK).

Problem is that how to show simple list people who have registered to spesific seminar? List should be shown in block or node. It wont be enough to check results in webform-module results page. And list should be categorized by event type.