Images downloaded from File Manager not opening in image viewers/editors. Damaged?

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Images downloaded from File Manager are not opening in image viewers/editors, and error message shows about file being damaged or Sketch app says "The document “filename.jpg” could not be opened".


Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.2.1
Version Installed - 8.2.1
Database Version - 20170802000000

# concrete5 Packages
Easy Image Slider (1.2), Framework Theme (1.6.2), More Block Templates (0.9.6), Vivid Simple Accordion (1.0.1), Whale Galleria (1.2.4)

# concrete5 Overrides
mail/block_form_submission.php

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

# Server Software
Apache

# Server API
litespeed

# PHP Version
5.6.32

# PHP Extensions
bcmath, bz2, calendar, Core, ctype, curl, date, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imap, intl, ionCube Loader, json, libxml, litespeed, mbstring, mcrypt, mhash, mysql, mysqli, mysqlnd, openssl, pcntl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, readline, Reflection, session, shmop, SimpleXML, sockets, SourceGuardian, SPL, sqlite3, standard, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 60
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 120
max_input_vars - 5000
memory_limit - 128M
post_max_size - 100M
sql.safe_mode - Off
upload_max_filesize - 100M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
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

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36