Cart is empty when I click on checkout button

Permalink Browser Info Environment
I am trying to troubleshoot a Concrete5 website that I have taken over managing. It appears that sometimes when a user clicks views his cart with something in it and then clicks on the check out button the object disappears from the cart. Any suggestions as to why this may be happening? Thanks!

Type: Pre-Sale
Status: New
SharonMarks
View Replies:

concrete5 Environment Information

# concrete5 Version
5.6.1.2

# concrete5 Packages
Designer Content (3.1.1), Downloadable File Purchase (1.2.1), eCommerce (8.0), Form Tableless Layout (1.1.1), Manual Nav (1.3), Pro Blog (11.0.1), Responsive Starter Theme (1.0).

# concrete5 Overrides
blocks/readmore, blocks/problog_list, blocks/page_list, blocks/autonav, blocks/contact_info, blocks/cart_links, blocks/form, blocks/latest_journal, blocks/manual_nav, blocks/books_nav_category, blocks/product, blocks/product_list, blocks/book_list_page_title, blocks/content, blocks/search, controllers/checkout, elements/cart_item_list.php, elements/product, elements/checkout, elements/orders, helpers/pagination.php, models/order, models/payment, models/sales, models/core_commerce, single_pages/cart.php, single_pages/checkout, themes/forthcoming.php, themes/inanna

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
5.4.45

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imagick, imap, intl, ionCube Loader, json, libxml, mbstring, mcrypt, mhash, mssql, mysql, mysqli, odbc, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, pspell, Reflection, session, SimpleXML, soap, sockets, SourceGuardian, SPL, sqlite3, standard, tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, 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 - 256M
post_max_size - 64M
sql.safe_mode - Off
upload_max_filesize - 64M
mssql.max_links - Unlimited
mssql.max_persistent - Unlimited
mssql.max_procs - Unlimited
mssql.textlimit - Server default
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/601.5.17 (KHTML, like Gecko) Version/9.1 Safari/601.5.17

Hide Post Content

This will replace the post content with the message: "Content has been removed by an Administrator"

Hide Content

Request Refund

You have not specified a license for this support ticket. You must have a valid license assigned to a support ticket to request a refund.