Post installation

How do I set up file uploads to be queued for moderation before they can be available for download?

I was using 4.3.2 and tried the upgrade, which in turn came up with a bunch of sql errors, I removed the modules that were not stock, and also deleted the themes and tables as well. I still couldn't get the update to work so I went with a fresh installation.

The site looks well but after installing weblink 4.4, when a user clicks on "visit" it triggers a 500 internal server error. The weblink points to google.

I'm having problems logging in and logging out. I'm getting this message in response:

warning: Cannot modify header information - headers already sent by (output started at /home/brillo/public_html/network/themes/xtemplate/xtemplate.theme:270) in /home/brillo/public_html/network/includes/common.inc on line 236.

I have been able to create a single indivual's blog (I have turned on blogs, and have been able to post, etc.) but I have not been able to turn on a multi-author blog (like is possible in MovableType). Any thoughts? How do I do this?

Thanks.

I recently installed the 4.4.0 release candidate (about 7 days ago) and had already added a lot of content so wanted to upgrade my existig install to the final 4.4.0 rather than do a complete reinstall.

However, when I log I get the following message:

terminated request because of suspicious input data