Can't create pages

My client has seemingly lost the ability to create pages - they appear in the list of pages, but when I try to access the URL defined in the page settings, I get a 404.

Pages I created further back in time are fine, and the main web site seems to work just fine.

I've had them check the database to see whether it's full, but they just doubled the capacity and checked to see if there is sufficient space left, and there is apparently.

What else should I check?

PERCH INFORMATION
Perch: 2.3.2
Production mode: Production (100)
Installed apps: content (2.3.2), perch_forms (1.7), perch_blog (3.8.1)
DB driver: PDO
DB tables: access, accesslog, accesslog_bak, accesslog_bak1, aggregator_category, aggregator_category_feed, aggregator_category_item, aggregator_feed, aggregator_item, authmap, banner, banner_term, blocks, book, boxes, cache, comments, directory, files, filter_formats, filters, flexinode_data, flexinode_field, flexinode_type, flood, forum, history, img_assist_map, locales_meta, locales_source, locales_target, menu, moderation_filters, moderation_roles, moderation_votes, node, node_access, node_comment_statistics, node_counter, perch2_blog_authors, perch2_blog_categories, perch2_blog_comments, perch2_blog_posts, perch2_blog_posts_to_categories, perch2_blog_posts_to_tags, perch2_blog_tags, perch2_content_index, perch2_content_items, perch2_content_regions, perch2_content_resources, perch2_forms, perch2_forms_responses, perch2_navigation, perch2_navigation_pages, perch2_page_templates, perch2_pages, perch2_resources, perch2_settings, perch2_user_privileges, perch2_user_role_privileges, perch2_user_roles, perch2_users, permission, poll, poll_choices, profile_fields, profile_values, queue, role, search_index, search_total, sequences, sessions, system, term_data, term_hierarchy, term_node, term_relation, term_synonym, url_alias, users, users_roles, variable, view_argument, view_breadcrumb, view_filter, view_sort, view_tablefield, view_view, vocabulary, vocabulary_node_types, watchdog, webform, webform_component, webform_role_node, webform_submitted_data
Users: 7
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_forms/runtime.php');
?>
Scheduled tasks for perch_blog: delete_spam_comments (1440 mins)
Editor plug-ins: markitup, ckeditor
H1: 457f70e8a0c621ffc3a71027d2855370
L1: 890c1f513cb5b497bda4b7f61eae7715
headerColour: #ffffff
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 0
lang: en-gb
update_2.3: done
latest_version: 2.8.15
update_2.3.2: done
perch_blog_post_url: /news/post.php?s={postSlug}
perch_blog_update: 3.7.5
headerScheme: light
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 0
dashboard: 0
content_hideNonEditableRegions: 1
perch_blog_comment_notify: 0
logoPath: /perch/resources/tt.png
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_DB_USERNAME: jtarbuck
PERCH_DB_SERVER: 213.171.218.245
PERCH_DB_DATABASE: ttgames
PERCH_DB_PREFIX: perch2_
PERCH_TZ: GMT
PERCH_EMAIL_FROM: jon.tarbuck@mac.com
PERCH_EMAIL_FROM_NAME: Jon Tarbuck
PERCH_LOGINPATH: /perch
PERCH_PATH: /home/linnas02/t/ttgames.com-1090034144/user/htdocs/perch
PERCH_CORE: /home/linnas02/t/ttgames.com-1090034144/user/htdocs/perch/core
PERCH_RESFILEPATH: /home/linnas02/t/ttgames.com-1090034144/user/htdocs/perch/resources
PERCH_RESPATH: /perch/resources
PERCH_HTML5: 1
PERCH_ERROR_MODE: DIE
PERCH_DEBUG:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /home/linnas02/t/ttgames.com-1090034144/user/htdocs/perch/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_RWD:
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
HOSTING SETTINGS
PHP: 5.2.17
Zend: 2.2.0
OS: Linux
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: 5.5.60-MariaDB
MySQL server: 5.6.41-log
Extensions: date, libxml, openssl, pcre, zlib, bz2, calendar, ctype, curl, hash, filter, ftp, gettext, session, iconv, pcntl, posix, readline, Reflection, standard, shmop, sockets, SPL, exif, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xml, cgi-fcgi, bcmath, dba, gd, imap, json, ldap, mbstring, mcrypt, mhash, mssql, mysql, mysqli, ncurses, odbc, PDO, pdo_dblib, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, pspell, snmp, soap, tidy, xmlreader, xmlrpc, xmlwriter, zip, ionCube 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
PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
PWD: /var/www/fcgi
PHP_FCGI_MAX_REQUESTS: 100
FCGI_ROLE: RESPONDER
REDIRECT_on: 127.0.0.1
REDIRECT_UNIQUE_ID: W74GCuF0sXJbPKBaKmkyQQAAAAA
REDIRECT_HANDLER: application/x-httpd-php
REDIRECT_STATUS: 200
on: 127.0.0.1
UNIQUE_ID: W74GCuF0sXJbPKBaKmkyQQAAAAA
HTTP_HOST: ttgames.com
HTTP_X_REAL_IP: 81.138.153.30
HTTP_X_FORWARDED_FOR: 81.138.153.30
HTTP_CONNECTION: close
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_USER_AGENT: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
HTTP_REFERER: https://ttgames.com/perch/core/settings/
HTTP_ACCEPT_ENCODING: gzip, deflate
HTTP_ACCEPT_LANGUAGE: en-GB,en-US;q=0.9,en;q=0.8
HTTP_COOKIE: PHPSESSID=2p6uoe4rgb81mkt807su87q3e5
SERVER_SOFTWARE: Apache
SERVER_NAME: ttgames.com
SERVER_ADDR: 127.0.0.1
SERVER_PORT: 80
REMOTE_ADDR: 81.138.153.30
DOCUMENT_ROOT: /home/linnas02/t/ttgames.com-1090034144/user/htdocs
REQUEST_SCHEME: http
CONTEXT_PREFIX: /fcgi-bin/
CONTEXT_DOCUMENT_ROOT: /var/www/fcgi/
SERVER_ADMIN: support@fasthosts.com
SCRIPT_FILENAME: /home/linnas02/t/ttgames.com-1090034144/user/htdocs/perch/core/settings/diagnostics/index.php
REMOTE_PORT: 55418
REDIRECT_URL: /perch/core/settings/diagnostics/index.php
GATEWAY_INTERFACE: CGI/1.1
SERVER_PROTOCOL: HTTP/1.0
REQUEST_METHOD: GET
REQUEST_URI: /perch/core/settings/diagnostics/
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php
ORIG_SCRIPT_FILENAME: /var/www/fcgi/php-cgi
ORIG_PATH_INFO: /perch/core/settings/diagnostics/index.php
ORIG_PATH_TRANSLATED: /home/linnas02/t/ttgames.com-1090034144/user/htdocs/perch/core/settings/diagnostics/index.php
ORIG_SCRIPT_NAME: /fcgi-bin/php-cgi
PHP_SELF: /perch/core/settings/diagnostics/index.php
REQUEST_TIME: 1539180042