Upgrading a Blog (after site was hacked!)

Hi there, A client's site was hacked over the weekend. It's a pretty old site that's still is use. The index.php files and the Blog/index.php in particular were hacked. I backed up the SQL DB, rolled back the Perch/Core & Perch/addons/Apps folders and confirmed that the site's Perch was fairly old (v.2.4.9) So, I upgraded Perch to the latest version 2.8.34. Everything is back as it should be, however the blog no longer lets you add posts. I'm assuming this may be down to the upgrade itself? Can Perch admins confirm this and if so point me in the right direction to upgrade the existing blog. I've included necessary info below.

Diagnostics report
PERCH INFORMATION

Perch: 2.8.34
Production mode: Production (100)
Installed apps: content (2.8.34), assets (2.8.34), categories (2.8.34), perch_shop_foxycart (2), perch_blog (3.7.6), perch_upgrade (1.4)
DB driver: PDO
DB tables: perch2_blog_authors (2), perch2_blog_categories (1), perch2_blog_comments (0), perch2_blog_posts (207), perch2_blog_posts_to_categories (1), perch2_blog_posts_to_tags (0), perch2_blog_tags (0), perch2_categories (0), perch2_category_counts (0), perch2_category_sets (0), perch2_content_index (1616), perch2_content_items (3065), perch2_content_regions (111), perch2_navigation (0), perch2_navigation_pages (0), perch2_page_templates (1), perch2_pages (36), perch2_resource_log (2501), perch2_resource_tags (0), perch2_resources (203), perch2_resources_to_tags (0), perch2_settings (37), perch2_shop_categories (0), perch2_shop_log (165), perch2_shop_orders (165), perch2_shop_product_option_values (0), perch2_shop_product_options (0), perch2_shop_products (1), perch2_shop_products_to_categories (0), perch2_user_passwords (1), perch2_user_privileges (38), perch2_user_role_privileges (15), perch2_user_roles (2), perch2_users (2), perch_blog_categories (2), perch_blog_posts (105), perch_blog_posts_to_categories (1), perch_blog_posts_to_tags (0), perch_blog_tags (0), perch_contentItems (109), perch_settings (11), perch_users (3)
Users: 2
PHPMailer: 5.2.21
App runtimes:
<?php
    include(PERCH_PATH.'/core/apps/content/runtime.php');
    include(PERCH_PATH.'/addons/apps/perch_blog/runtime.php');
    include(PERCH_PATH.'/addons/apps/perch_shop_foxycart/runtime.php');
?>
Editor plug-ins: markitup
H1: c93d8562529e245e713fbbb0c08e0c96
L1: ad22f4b2896bc9a59bbaf77f466992e7
F1: 6a33f95eca3667f9e0c39bf5ca2980fe
headerColour: #ffffff
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 0
content_collapseList: 1
lang: en-gb
update_2.2.9: done
latest_version: 2.8.15
headerLinkColour: #000000
logoPath: /perch/resources/1312057531_slane_castle_logo_small.jpg
linkColour: #333333
editorMayDeleteRegions: 0
latestUpdate: 1.8.4
perch_blog_post_url: /blog/post.php?s={postSlug}
perch_blog_update: 3.7.5
on_sale_version: 2.8.34
update_2.4.9: done
perch_shop_foxycart_update: 2.0
headerScheme: light
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_upgrade_v1_prefix: perch_
perch_shop_foxy_url: https://slanecastle.foxycart.com/cart
perch_shop_foxy_api: zBDYu5Lu8HwU9BFez7N1pcGnpTfuGwb62EUrAAPCccsfDXk7ZYYe1zskixEP
dashboard: 0
hide_pwd_reset: 0
content_hideNonEditableRegions: 0
content_frontend_edit: 0
perch_blog_comment_notify: 0
perch_shop_foxy_security: 0
perch_shop_display_oos: 0
perch_shop_product_url: /castle//slane-2015-vip.php?s={productSlug}
update_2.8.34: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_DB_USERNAME: slanecas_slanec
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: slanecas_slanec
PERCH_DB_PREFIX: perch2_
PERCH_TZ: UTC
PERCH_EMAIL_FROM: studio@bammedia.ie
PERCH_EMAIL_FROM_NAME: Bridget Kerrigan
PERCH_LOGINPATH: /perch
PERCH_PATH: /home/slanecas/public_html/perch
PERCH_CORE: /home/slanecas/public_html/perch/core
PERCH_RESFILEPATH: /home/slanecas/public_html/perch/resources
PERCH_RESPATH: /perch/resources
PERCH_HTML5: 1
PERCH_RUNWAY:
PERCH_ERROR_MODE: DIE
PERCH_DATE_LONG: %d %B %Y
PERCH_DATE_SHORT: %d %b %Y
PERCH_TIME_SHORT: %H:%M
PERCH_TIME_LONG: %H:%M:%S
PERCH_RUNWAY_ROUTED:
PERCH_STRONG_PASSWORDS:
PERCH_DEBUG:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /home/slanecas/public_html/perch/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_RWD:
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_PARANOID:
PERCH_FORCE_SECURE_COOKIES:
PERCH_PASSWORD_MIN_LENGTH: 6
PERCH_MAX_FAILED_LOGINS: 10
PERCH_AUTH_LOCKOUT_DURATION: 1 HOUR
PERCH_VERIFY_UPLOADS:
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
PERCH_SESSION_TIMEOUT_MINS: 20
HOSTING SETTINGS

PHP: 5.6.29
Zend: 2.6.0
OS: Linux
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: mysqlnd 5.0.11-dev - 20120503 - $Id: 76b08b24596e12d4553bd41fc93cccd5bac2fe7a $
MySQL server: 5.5.52-cll
Free disk space: 1.01 TB
Extensions: Core, date, ereg, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, filter, ftp, gd, gettext, gmp, hash, iconv, SPL, json, mbstring, mcrypt, session, mysql, mysqli, standard, Phar, posix, pspell, Reflection, mysqlnd, SimpleXML, sockets, imap, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, zip, cgi-fcgi, PDO, pdo_sqlite, pdo_mysql, ionCube Loader, Zend Guard Loader
GD: Yes
ImageMagick: No
PHP max upload size: 20M
PHP max form post size: 20M
PHP memory limit: 64M
Total max uploadable file size: 20M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: No
DOCUMENT_ROOT: /home/slanecas/public_html
GATEWAY_INTERFACE: CGI/1.1
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
HTTP_ACCEPT_ENCODING: gzip, deflate, sdch
HTTP_ACCEPT_LANGUAGE: en-GB,en-US;q=0.8,en;q=0.6
HTTP_CONNECTION: keep-alive
HTTP_COOKIE: gallery-fadeshow1=2; __unam=5b7ad6a-159d048e45c-1d8a4ce-12; __utma=87641050.1785268930.1485258155.1485258155.1485258155.1; __utmb=87641050.6.10.1485258155; __utmc=87641050; __utmz=87641050.1485258155.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); cmsa=1; PHPSESSID=090c74943347da01901ff42bf4d70ce3
HTTP_HOST: www.slanecastle.ie
HTTP_REFERER: https://www.slanecastle.ie/perch/core/settings/diagnostics/
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36
PATH: /bin:/usr/bin
QUERY_STRING: extended
REDIRECT_STATUS: 200
REMOTE_ADDR: 86.47.33.111
REMOTE_PORT: 10266
REQUEST_METHOD: GET
REQUEST_URI: /perch/core/settings/diagnostics/?extended
SCRIPT_FILENAME: /home/slanecas/public_html/perch/core/settings/diagnostics/index.php
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php
SERVER_ADDR: 80.93.29.14
SERVER_ADMIN: webmaster@slanecastle.ie
SERVER_NAME: www.slanecastle.ie
SERVER_PORT: 80
SERVER_PROTOCOL: HTTP/1.1
SERVER_SIGNATURE: <address>Apache Server at www.slanecastle.ie Port 80</address>
SERVER_SOFTWARE: Apache
SITE_WEB_SCRIPT_EXECUTE: /castle/pdf/press/premium.php
UNIQUE_ID: WIdBslBdHQ4AACBF46EAAAAf
PHP_SELF: /perch/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1485259186.75
REQUEST_TIME: 1485259186
argc: 1

**** TEMPLATE****

<?php include('../perch/runtime.php'); ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml">
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<title>Lord Henry's Blog - Slane Castle</title>
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      <li><a href="../castle/castle_press.php" title="PRESS" target="_parent">PRESS</a>
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<img src="../castle/images/castle_line_main.png" alt="left line" width="540" height="7" border="0" />
<h1>Lord Henry's Blog</h1>
<img src="../castle/images/castle_line_main2.png" alt="left line" width="540" height="7" border="0" style="margin-bottom:10px;"/>

<!--start of blog entry-->
<!-- this is an example blog homepage showing a simple call to perch_blog_recent_posts()

Posts are displayed using the templates stored in perch/apps/perch_blog/templates/blog you can edit these as you wish, making sure that the 
paths used in these templates are correct for your installation.
 -->
<?php 
    perch_blog_recent_posts(5);
?>

<p><a href="archive.php">More posts</a></p>

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