Problems after installation, CMS, Blogs, Profile wont work.

[carubmun]

Finished the install, seemingly went well.
This is not my first install, ive installed vb4 many times already.
This time though... ive noticed that a lot of stuff just doesnt work right.
When i click on certain things i end up going to a blank page.
No errors, nothing... just a completely white page with nothing on the screen.

It happens when i make a post or thread as well.
I make a post, click on "submit new thread"... and it takes me directly to a blank page.
But if i hit back on my browser and get back to the forum... the post/thread i just tried to creat is actually there, created just fine.

Why is it that when i create the thread/post that it takes me to a blank page?

I suspect this has something to do with the way my site/forum is named, maybe an htaccess issue, or possibly a cookie issue.
This is my latest incarnation of a test site, i wipe my test site every so often and reinstall... this problem happened right off the bat, i have not installed any plugins/mods.
I did install some styles, but this problem happened before i installed anything, and it continues to be a problem even with the default style.

Any help?

EDIT: More info...
The test forum is on a directory on my root labeled "alpha".

In settings i have the following...
Forum URL: http://www.example.com/alpha/forums
Always use Forum URL as Base Path: Yes
Homepage URL: http://www.example.com/alpha
CMS URL: I left it blank
Default CMS Page: 1-Index
Site Tab URL: content.php
Path to Save Cookies: /alpha/
Cookie Domain: Blank


The htaccess in /alpha has not been touched, its whatever vbulletin comes with.
I have a customized htaccess in my main /forums directory, mainly to stop unruly bots.
There is no .htaccess file in the servers root.
Im on a VPS.

Thanks for the help.