We are experiencing a weird problem on one of about 20 sites on our dedicated environment. Our typical dev approach has our codebase in a typical dev/staging/production scenario. On the problem site, File Manager, anything under 'Files' actually will not render in any browser. Everything works perfectly in our dev and staging environments but when promoted to live it simply fails to render. All files/directories have been confirmed to exist/be of correct permissioning.

Install data:
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# concrete5 Version
5.5.2.1

# concrete5 Packages
Advanced Forms (1.7.1.1), Item Calendar (1.7.1).

# concrete5 Overrides
blocks/announcements, controllers/dashboard, controllers/page_types, js/jquery.validationEngine.js, js/jquery.validationEngine-en.js, css/validationEngine.jquery.css, single_pages/dashboard, themes/towson-wellness

# Server Software
Apache/2.2.3 (Red Hat)

# Server API
apache2handler

# PHP Version
5.3.6

# PHP Extensions
apache2handler, apc, bz2, calendar, Core, ctype, curl, date, dom, ereg, exif, fileinfo, filter, ftp, gd, gearman, gettext, gmp, hash, iconv, json, libxml, mbstring, memcache, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, shmop, SimpleXML, soap, sockets, SPL, standard, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xdebug, xml, xmlreader, xmlwriter, xsl, zip, zlib.

# PHP Settings
apc.max_file_size - 1M
log_errors_max_len - 1024
max_execution_time - 5
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
memory_limit - 250M
post_max_size - 100M
safe_mode - Off
safe_mode_exec_dir - <i>no value</i>
safe_mode_gid - Off
safe_mode_include_dir - <i>no value</i>
sql.safe_mode - Off
upload_max_filesize - 100M
memcache.max_failover_attempts - 20
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 100000
pcre.recursion_limit - 100000
session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
safe_mode_allowed_env_vars - PHP_
safe_mode_protected_env_vars - LD_LIBRARY_PATH
xdebug.max_nesting_level - 100
xdebug.var_display_max_children - 128
xdebug.var_display_max_data - 512
xdebug.var_display_max_depth - 3