Drupal 7.x

I got this ajax error error and I'm not sure what to do about it. I only have one theme available. Please, please help!

An AJAX HTTP error occurred.
HTTP Result Code: 500
Debugging information follows.
Path: /system/ajax
StatusText: Internal Server Error

Dear all,
I'm trying to setup a Drupal 7.4 multi-language website but I'm not being able to do exactly what I want.
My idea is to have all English pages as "myhost/en/pagetitle" and all the Italian pages as "myhost/it/italianpagetitle").
I have enabled the modules Locale, Content Translation, Pathauto, Entity and Title.
I could install Italian Drupal interface using the .po file and it seems to have worked fine.
For the English page the alias are created correctly and everything works as expected,
but for the corresponding Italian pages, the alias is created but then it doesn't work.
For example for the "About Me" page the English version is correctly created an accessible
using the alias en/aboutme, whereas the for the Italian translation "Chi sono" the alias it/chishono
(as I could check in admin/config/search/path) is created but then it is not accessible. Although
if I use the system address, (something like node/84), the page is correctly displayed
and the English version linked correctly.
Can you please help me to figure out what I'm making wrong?
I thought I've followed the documentation right, but evidently there is something I misunderstood,
but I can't understand what.

Also if you think there is any better way to handle a multilanguage website, please let me know
I'm a newbie and any help is greatly appreciated.

I have a php page on the server which is loaded in some nodes with different parameters. The page looks for some info. ( in french) in the database and displays them.

The accents for the words loaded from the database are not displayed correctly.

any idea please ?

I'm theming my d7. But I found it hard to print current term name on taxonomy/term/tid page. I can see it in meta head title, how can i get it. Plz help!

Hey guys I get this error when I view a node that does not contain a certain field. The field is a video field and when the node contains a video I do not get this error.

Warning: array_flip() [function.array-flip]: Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 178 of /home/jgregory/public_html/equipment/includes/entity.inc).

at this url

http://equipment.jgregorydesigns.com/?q=node/52

any help would be greatly appreciated

Hey,
I was hoping someone could show me how to apply CSS so it ONLY affects certain image styles. I have images on certain content types but I have several different styles for the same image field name, some styles I want floating the img left, other right, etc. So far I only know how to use .field-name but I need to write CSS for specific styles so that it doesn't affect other styles for the same picture. I noticed that each different style has its own directory...Can I write CSS that is directory specific and would that solve my issue? Thank you.