Can't edit posts/pages or delete plugins on local server (Server error 500)

Hey all.

Ran into a little problem today moving over a local copy of WordPress living inside my htdocs folder (MAMP) to another folder inside htdocs. Just has a different name.
It’s been a while since I have done any moving of databases, so it’s likely that whateve ris going awry is an easy fix.

To tell you what I did in a nutshell:

First off, I am using MAMP. All my files live inside of the htdocs. I’m using PHP 5.3.6, running off the Apache 8888 port.

1.) All within the htdocs I copied all my files from the old folder, into the new one.
2.) I created a new database in phpMyAdmin
3.) I exported the old database files from phpMyAdam
4.) I did a find/replace for URLs within the exported .sql file
5.) I imported the newly updated DB file into the new DB in phpMyAdmin
6.) I updated the wp-config file to have the new DB name
7.) I updated my .htaccess file

So the entire site works, permalinks work properly and all after doing all of this, but it’s only when I try to edit a single post, custom post type, page or delete a plugin, I am directed to a Server error 500. Saying “It may be down for maintenance or configured incorrectly.”

I am lost as to what’s going on at this point. I’ve done some googling without much success.

Here is my .htaccess file:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /cookuitoolkit/
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /cookuitoolkit/index.php [L]
</IfModule>

# END WordPress

Can anyone think of loose ends I am not addressing? I feel like somewhere between updating the URLs in the new DB file and importing them has gotten things messed up.

Both sites in the old folder and the new folder are having the exact same issue.
The reason I did this move was because I added my site into Subversion for versioning at work.

Any help would be greatly appreciated.

Thanks!

Kalee