Can't save Design & Custom Template

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We are unable to save changes to the design & custom template block settings on our site. We can make changes but both the save and cancel buttons are not doing anything. It had been working fine when initially creating the site, it was only recently when trying to make a change to a page that we noticed this problem. The only thing that I can think of that was changed between then and now was adding Cloudflare to the site, but I can not think of why that could be causing the problem.


Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.4.0
Version Installed - 8.4.0
Database Version - 20180524000000

# concrete5 Packages
ExchangeCore reCAPTCHA (1.1.1), Fruitful (1.2), Simple Gallery (1.0.7)

# concrete5 Overrides
blocks/audio/mediaelement/lang/ca.js, blocks/audio/mediaelement/lang/cs.js, blocks/audio/mediaelement/lang/de.js, blocks/audio/mediaelement/lang/es.js, blocks/audio/mediaelement/lang/fa.js, blocks/audio/mediaelement/lang/fr.js, blocks/audio/mediaelement/lang/hr.js, blocks/audio/mediaelement/lang/hu.js, blocks/audio/mediaelement/lang/it.js, blocks/audio/mediaelement/lang/ja.js, blocks/audio/mediaelement/lang/ko.js, blocks/audio/mediaelement/lang/nl.js, blocks/audio/mediaelement/lang/pl.js, blocks/audio/mediaelement/lang/pt.js, blocks/audio/mediaelement/lang/ro.js, blocks/audio/mediaelement/lang/ru.js, blocks/audio/mediaelement/lang/sk.js, blocks/audio/mediaelement/lang/sv.js, blocks/audio/mediaelement/lang/uk.js, blocks/audio/mediaelement/lang/zh-cn.js, blocks/audio/mediaelement/lang/zh.js, blocks/audio/mediaelement/lang, blocks/audio/mediaelement/renderers/dailymotion.js, blocks/audio/mediaelement/renderers/dailymotion.min.js, blocks/audio/mediaelement/renderers/facebook.js, blocks/audio/mediaelement/renderers/facebook.min.js, blocks/audio/mediaelement/renderers/soundcloud.js, blocks/audio/mediaelement/renderers/soundcloud.min.js, blocks/audio/mediaelement/renderers/twitch.js, blocks/audio/mediaelement/renderers/twitch.min.js, blocks/audio/mediaelement/renderers/vimeo.js, blocks/audio/mediaelement/renderers/vimeo.min.js, blocks/audio/mediaelement/renderers, blocks/audio/mediaelement/mediaelement-and-player.js, blocks/audio/mediaelement/mediaelement-and-player.min.js, blocks/audio/mediaelement/mediaelement-flash-audio-ogg.swf, blocks/audio/mediaelement/mediaelement-flash-audio.swf, blocks/audio/mediaelement/mediaelement-flash-video-hls.swf, blocks/audio/mediaelement/mediaelement-flash-video-mdash.swf, blocks/audio/mediaelement/mediaelement-flash-video.swf, blocks/audio/mediaelement/mediaelement.js, blocks/audio/mediaelement/mediaelement.min.js, blocks/audio/mediaelement/mediaelementplayer-legacy.css, blocks/audio/mediaelement/mediaelementplayer-legacy.min.css, blocks/audio/mediaelement/mediaelementplayer.css, blocks/audio/mediaelement/mediaelementplayer.min.css, blocks/audio/mediaelement/mejs-controls.png, blocks/audio/mediaelement/mejs-controls.svg, blocks/audio/mediaelement, blocks/audio/add.php, blocks/audio/controller.php, blocks/audio/db.xml, blocks/audio/edit.php, blocks/audio/form.php, blocks/audio/icon.png, blocks/audio/view.js, blocks/audio/view.php, blocks/audio, blocks/event_list/view.css, blocks/event_list/view.php, blocks/event_list, blocks/page_list/templates/thumbnail_grid/view.css, blocks/page_list/templates/thumbnail_grid/view.php, blocks/page_list/templates/thumbnail_grid, blocks/page_list/templates, blocks/page_list/tools/preview_pane.php, blocks/page_list/tools, blocks/page_list/auto.js, blocks/page_list/view.css, blocks/page_list/view.php, blocks/page_list, blocks/social_links/view.php, blocks/social_links, themes/fruitful/css/iGotStyle.less, themes/fruitful/css/bootstrap.less, themes/fruitful/css/mixins.less, themes/fruitful/css/resets.less, themes/fruitful/css, themes/fruitful/js/bootstrap.min.js, themes/fruitful/js/functions.js, themes/fruitful/js, themes/fruitful/inc/footer.php, themes/fruitful/inc/header.php, themes/fruitful/inc, themes/fruitful

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - In all cases.
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
7.2.5

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, imap, intl, json, libxml, mbstring, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, shmop, SimpleXML, soap, sodium, SPL, sqlite3, standard, tidy, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 50000
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - -1
max_input_vars - 5000
memory_limit - 256M
post_max_size - 64M
upload_max_filesize - 64M
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36