file manager - unable to download images or sets

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I wanted to back up some images I have in sets. these images were uploaded at various times and are therefore in all sorts of folders and sub folders (as is the c5 way), I have selected a set of images and then I "select all", the from dropdown, I choose "download", but nothing happens at all. I have tried in IE and Ff and chrome. nothing happens. No zip file or anything appears.

I have not used the download facility ever before so don't know what to expect.
any clues please ?

# concrete5 Version
5.6.1.2
# concrete5 Packages
Autonav Exclude Subpages (1.1.1), Dynamic Iframe (1.61), Galleria image gallery (2.0), Page Hit Counter (1.1), Random Image (1.0.1), Silence Theme (1.3), Sortable Fancybox Gallery (1.15), tnSpacer (1.3).
# concrete5 Overrides
None
# Server Software
Apache/2.2.31 (Unix) mod_ssl/2.2.31 OpenSSL/1.0.1e-fips DAV/2 mod_bwlimited/1.4
# Server API
cgi-fcgi
# PHP Version
5.4.45
# PHP Extensions
bcmath, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, filter, ftp, gd, hash, iconv, imap, ionCube Loader, json, libxml, mbstring, mcrypt, mysql, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, SimpleXML, soap, sockets, SPL, sqlite3, standard, suhosin, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend Guard Loader, zip, zlib.