Thumbnail Images not loading in IE and won't open in Photoshop

Reported by a client today that the thumbnail images that are auto generated by Perch when uploading a PDF are not loading in IE11 (I suspect other IE's too). They seem to work fine in all my Mac browsers. Although the colours are off in Safari. However, when I try to bring the generated thumbnail image into Photoshop I also get this error; 'Could not complete your request because the file-format module cannot parse the file.'

I think the two are likely related.

This occurs on both GD and iMagick generated images.

Here are some screenshots. Normal (How it should looke) Chrome Mac: https://cl.ly/0u3F290z3X1j

Colours incorrect in Safari; https://cl.ly/3A2w2E312J2h

Not loading at all in IE https://cl.ly/1R0I1Q2F2R0l

Any ideas where to look or how to resolve?

Thanks, Terry

Here is my diagnostics.

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_blog (5.0), perch_gallery (2.8.6)
DB driver: PDO
DB tables: perch2_blog_authors (2), perch2_blog_categories (3), perch2_blog_comments (0), perch2_blog_index (3783), perch2_blog_posts (111), perch2_blog_posts_to_categories (71), perch2_blog_posts_to_tags (14), perch2_blog_sections (2), perch2_blog_tags (4), perch2_blogs (1), perch2_categories (13), perch2_category_counts (3), perch2_category_sets (2), perch2_content_index (10018), perch2_content_items (2003), perch2_content_regions (339), perch2_gallery_albums (14), perch2_gallery_image_versions (750), perch2_gallery_images (144), perch2_navigation (2), perch2_navigation_pages (74), perch2_page_templates (8), perch2_pages (70), perch2_resource_log (3037), perch2_resource_tags (31), perch2_resources (1831), perch2_resources_to_tags (61), perch2_settings (43), perch2_user_passwords (0), perch2_user_privileges (40), perch2_user_role_privileges (17), perch2_user_roles (3), perch2_users (2)
Users: 2
PHPMailer: 5.2.21
App runtimes:
<?php
    $apps_list = array(
        'content',
        'categories',
        'perch_blog',
        'perch_gallery',
    );
Scheduled tasks for perch_blog: delete_spam_comments (1440 mins)
Editor plug-ins: markitup
H1: ae7f2c019b094237eedda59980985f2d
L1: e3ccc6e3c6b9b672595ab99036c4b52c
F1: 6a33f95eca3667f9e0c39bf5ca2980fe
headerColour: #fc5d20
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 0
lang: en-gb
update_2.4.4: done
on_sale_version: 2.8.34
perch_blog_post_url: /news/{postSlug}
perch_blog_update: 5.0.1
headerScheme: dark
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 7
dashboard: 1
content_hideNonEditableRegions: 0
content_frontend_edit: 0
perch_blog_comment_notify: 0
update_2.4.5: done
perch_gallery_update: 2.8.5
perch_gallery_bucket_mode: single
perch_gallery_bucket: gallery
perch_gallery_basicUpload: 0
update_2.4.6: done
update_2.4.7: done
update_2.4.9: done
hide_pwd_reset: 0
logoPath: /assets/resources/logo-amasci-perch-orange.png
update_2.5.4: done
update_2.6.3: done
update_2.7.9: done
update_2.7.10: done
update_2.8.6: done
update_2.8.8: done
latest_version: 2.8.15
update_2.8.10: done
update_2.8.14: done
update_2.8.15: done
update_2.8.18: done
update_2.8.25: done
update_2.8.29: done
update_2.8.34: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_DB_USERNAME: plowmancraven-db
PERCH_DB_DATABASE: plowmancraven
PERCH_RESFILEPATH: /home/plowmancraven/public_html/assets/resources
PERCH_SSL: 1
PERCH_DB_SERVER: localhost
PERCH_DB_PREFIX: perch2_
PERCH_RESPATH: /assets/resources
PERCH_TZ: Europe/London
PERCH_EMAIL_FROM: terry@amasci.co.uk
PERCH_EMAIL_FROM_NAME: Terry Upton
PERCH_LOGINPATH: /cms
PERCH_CLEAN_RESOURCES: 1
PERCH_PATH: /home/plowmancraven/public_html/cms
PERCH_CORE: /home/plowmancraven/public_html/cms/core
PERCH_HTML5: 1
PERCH_RWD: 1
PERCH_UNDO_BUFFER: 3
PERCH_IMAGE_LIB: imagick
PERCH_GMAPS_API_KEY: AIzaSyCNnejdq_qAjEn4bGHWiY7ugTcy0_1VcGc
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/plowmancraven/public_html/cms/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_HTML_ENTITIES:
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: 5.4.45
Zend: 2.4.0
OS: Linux
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: mysqlnd 5.0.10 - 20111026 - $Id: c85105d7c6f7d70d609bb4c000257868a40840ab $
MySQL server: 5.5.52-cll
Free disk space: 300.69 GB
Extensions: Core, date, ereg, libxml, openssl, pcre, zlib, filter, hash, pcntl, readline, Reflection, SPL, session, standard, cgi-fcgi, bcmath, calendar, ctype, curl, dom, fileinfo, ftp, gd, iconv, imap, json, imagick, mbstring, mcrypt, mysqlnd, mysql, mysqli, PDO, pdo_mysql, pdo_sqlite, Phar, posix, SimpleXML, sockets, sqlite3, tokenizer, xml, wddx, xmlreader, xmlwriter, xsl, zip, mhash, Zend Guard Loader
GD: Yes
ImageMagick: Yes
PHP max upload size: 100M
PHP max form post size: 100M
PHP memory limit: 250M
Total max uploadable file size: 100M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: No
CONTEXT_DOCUMENT_ROOT: /home/plowmancraven/public_html
DOCUMENT_ROOT: /home/plowmancraven/public_html
GATEWAY_INTERFACE: CGI/1.1
HTTPS: on
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
HTTP_ACCEPT_ENCODING: gzip, deflate, sdch, br
HTTP_ACCEPT_LANGUAGE: en-GB,en-US;q=0.8,en;q=0.6
HTTP_CONNECTION: keep-alive
HTTP_COOKIE: _hjIncludedInSample=1; gwcc=%7B%22fallback%22%3A%2201582765566%22%2C%22clabel%22%3A%22UyETCPah82kQidfJogM%22%2C%22backoff%22%3A86400%2C%22backoff_expires%22%3A1484989355%7D; __atuvc=25%7C2%2C25%7C3; __atuvs=5881d2290351ba84001; _ga=GA1.3.1800983148.1484066360; cmsa=1; PHPSESSID=p0u27rg19hrl0q7rgm6fl1bsr4
HTTP_HOST: www.plowmancraven.co.uk
HTTP_REFERER: https://www.plowmancraven.co.uk/cms/core/settings/diagnostics/
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.87 Safari/537.36
PATH: /bin:/usr/bin
QUERY_STRING: extended
REDIRECT_STATUS: 200
REMOTE_ADDR: 81.133.44.91
REMOTE_PORT: 36432
REQUEST_METHOD: GET
REQUEST_SCHEME: https
REQUEST_URI: /cms/core/settings/diagnostics/?extended
SCRIPT_FILENAME: /home/plowmancraven/public_html/cms/core/settings/diagnostics/index.php
SCRIPT_NAME: /cms/core/settings/diagnostics/index.php
SCRIPT_URI: https://www.plowmancraven.co.uk/cms/core/settings/diagnostics/
SCRIPT_URL: /cms/core/settings/diagnostics/
SERVER_ADDR: 217.19.241.95
SERVER_ADMIN: webmaster@plowmancraven.co.uk
SERVER_NAME: www.plowmancraven.co.uk
SERVER_PORT: 443
SERVER_PROTOCOL: HTTP/1.1
SERVER_SOFTWARE: Apache
SSL_TLS_SNI: www.plowmancraven.co.uk
UNIQUE_ID: WIHXXQ9ztlU-nLU2CcAGRgAAAAs
PHP_SELF: /cms/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1484904285.22
REQUEST_TIME: 1484904285