File Manager not uploading

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Hallo,

I'm running 5.6.3.1, and for some reason I can't fathom the File Manager has stopped uploading anything. It doesn't give me any error messages; the little flickering grey boxes which indicate that the upload is in progress just keep flickering, with no end result. I've come across the same thing in the past but it's always been a problem with the file name, like using a name with a gap in the middle - but this time it won't upload any of my files.

Incidentally I've got another site which is also running Concrete 5.6.3.1, and that one's working fine.

Any ideas would be gratefully received. My environment information is as follows:

# concrete5 Version
5.6.3.1

# concrete5 Packages
eCommerce (2.8.12), Login (1.1.1), Mailing List (2.54), Page password (1.1.4), Whitespace Theme (1.2).

# concrete5 Overrides
themes/drhairytheme

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - Off
Full Page Caching - Off

# Server Software
Apache/2.2.25 (Unix) mod_ssl/2.2.25 OpenSSL/0.9.8e-fips-rhel5 DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 PHP/5.3.27

# Server API
apache2handler

# PHP Version
5.3.27

# PHP Extensions
apache2handler, bcmath, calendar, Core, ctype, curl, date, dom, ereg, filter, ftp, gd, hash, iconv, imap, ionCube Loader, json, libxml, mbstring, mcrypt, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, posix, Reflection, session, SimpleXML, sockets, SPL, SQLite, sqlite3, standard, timezonedb, tokenizer, xml, xmlreader, xmlwriter, Zend Guard Loader, zip, zlib.

# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 128M
post_max_size - 8M
safe_mode - Off
safe_mode_exec_dir - /usr/local/php/bin
safe_mode_gid - Off
safe_mode_include_dir - <i>no value</i>
sql.safe_mode - Off
upload_max_filesize - 10M
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 - nocache
session.gc_maxlifetime - 7200
safe_mode_allowed_env_vars - PHP_
safe_mode_protected_env_vars - LD_LIBRARY_PATH