That's it really. I can't use .htaccess on my blog because the file below causes the errors mentioned. Any help would be greatly appreciated.

This is the file that makes my site inaccessible. It's in the root folder / above public_html. The reason I am using a file from July 2013 is that as one of my attemtps to correct this error, I tried to find the .htaccess file that was provided with 3.3.3.

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# Apache configuration for b2evolution's base folder
# Lines starting with # are comments.
# Updated 2013-07-16

# PHP / SECURITY:
<IfModule mod_php5.c>
# On some overly "secured" systems, the following may need be added in
#each folder:
# AddHandler application/x-httpd-php5 .php

# The following will try to configure PHP in the way
#b2evolution would like it to be:
php_flag register_globals Off
php_flag display_errors On
php_value error_reporting E_ALL

# You may also need some of the following:
# Increase memory limit
# php_value memory_limit 256M
</IfModule>

# DISABLE LISTING FILES ON SERVER:
# Don't show directory contents (not desirable, especially for
#media folders)
Options -Indexes
# Note: if you have access to the command line of your server,
#it would probably
# be even better to type this: a2dismod autoindex
# (This disables the directory listing module completely)

# DEFAULT DOCUMENT TO DISPLAY:
# In case no specific file is requested, we want to fall back to
#index.php
# In case some subdirectories are accessed, we want to display
#index.html
<IfModule mod_dir.c>
DirectoryIndex index.php index.html
</IfModule>

# CLEAN URLS:
# The following will ensure you can pass extra params after the
#filename on the URL
AcceptPathInfo On

# CATCH EVERYTHING INTO B2EVO: (even if no php file appears in
#the URL)
# The following will allow you to have a blog running right off
#the site root,
# using index.php as a stub but not showing it in the URLs.
# This will add support for URLs like:
#http://example.com/2006/08/29/post-title
<IfModule mod_rewrite.c>
RewriteEngine On

# This line may be needed or not.
# enabling this would prevent running in a subdir like
#/blog/index.php
# RewriteBase /

# Redirect anything that's not an existing directory or
#existing file to index.php:
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule . index.php [L]