I am trying run the install.php. The page opens and does not run the security checks or anything. The farthest it get is at the top of the page where it says "UBB Threads Upgrad" (without the e or anything after it) and underneath that is a blank page.

On the left side the "permissions" is highlighted green but the page just sits there.

I can run php scripts fine so I am stuck at this step.

??

I'd do a quick check to make sure the install file was uploaded to the server properly (not corrupted). If that looks ok, then you can open a support ticket if you want and we'll take a look. We'd need to get the URL and the ftp information and should be able to figure out what's going on.

Huh?
Why does it say upgrade if you are running the install script.
If you are upgrading you would run the upgrade script.

I agree. Why am I getting a page that has upgrade in it? I am doing a fresh install. I even tried deleted the upgrade files in the install dir and I still get the same message.

I copied over the entire install directory from the 7-5-4-2 zip file I downloaded the other day so maybe I have corrupt source files. I will try downloading it again and running it. Then I will make a support ticket.

Strange...

Dumb question, you say you copied the entire install directory; did you copy just that directory, or all of the files? I know the script will die if it's missing libs, scripts, etc; the only time you can just copy the install directory is during an upgrade (and that method isn't really supported too much)

Yes I did copy the whole directory structure a couple of times, all the subdirs are there but I have some more info:

I can run a test.php file from the root of the website and it reports my php version etc. I can also run that same test.php file from the forum directory. I can also run the index.php from that install directory. When I try to run that install.php I get that freeze up thing.

One clue may be this error: - CGI Error
The specified CGI application misbehaved by not returning a complete set of HTTP headers.

This happens when I try to run certain php files on this site. I found a thread that talks about using php-cgi (which I am using) and IIS, the php scripts contained 2 or more frames, causing this error. I am trying to figure out if I have correct settings on this website (IIS6). Should I see anything is the website properties under ISAPI Filters? I am sure I have the PHP Web extension correct though.

Well If I was betting I would say you may have some file permission errors. Meaning the file/directory structure is not set correctly per the installation guidelines.
But to save you time and heartache it may be best to follow Scott's suggestion and just open a support ticket.

There was a small php test script to check for compatibility some where in the purchase area but I can't seem to find it anymore. Maybe it was overlooked when the site moved.

Yeah, I guess I will just open a ticket. I wondered about permissions also but I checked them quite a few times now.

Well, thanks for the help everybody.

Oh, here is the test script.
http://www.ubbcentral.com/demo.php
Way down at the bottom is a link to download it.

sounds like mod_security to me... just my :2c:

additionally, make sure you aren't running php 5.3 or greater..