Upgrading Drupal

I had converted the d6 theme to d7, i have made necessary changes, but some of the basic node pages are showing as "Array" in the front-end. Give me suggestion, this is very urgent

We've updated our multisite drupal installations from 6.20 to 6.22 (through 6.21). In one installation there's now a problem, that Drupal's not recognizing updated core in "subsites". Mainsites OK.

In subsites status report page it says that current version is 6.22, but also that "Unsecure, update available 6.22". And in available updates page it says current version is 6.20 and update needed. When I check site with Drush, it says version is 6.22.

Could anyone help, i am new in drupal. I added an image on the main page in my site www.nedwings.nl (drupal 6.xx) this site is hosted extern. but the image is not loaded whereas the link to the image is correct. This problem is solved.
Thanks guys.

I have made an update from version 7.4 I think it was to the newest 7.7 of Drupal core.

During the opdate all worked fine but I got an error with Watchdog_err when I returned to Front page.
Found a solution for that (should be Watchdog_error in files.inc) on Drupal.
Then I found that none of the layout was used.
I solved that by removing the aggregration of the CSS and JavaScribts.

Recently the core of a multisite Drupal setup was upgraded to 6.22 from 6.13.

Now all forms that include the form_token and form_build_id don't work. I can't clear cache, delete nodes, use the update.php function, search using keywords, and a lot more.

Has this happened to anyone before?

I've tried overwriting all the core modules, clearing the javascript, temporarily deleting all functions from template.php, and more.

Next, I'm going to try to overwrite the drupal_get_form($form_id) function.

Any ideas?

Did anyone ever managed to successfully migrate to version 6.12 to 7.0?

If yes what is the secret?

Tks