Firstly, thank you for an excellent product!!
On page titles of archive (product_category) and children of /store (/store/*) the blogtitle will not show to the right side of the |, resulting in something like: "Product Category: Contemporanea | " and "Your Shopping Cart | " which can of course "spook" the customer.
To troubleshoot I have created on my local LAMP server a duplicate install with wordpress 3.8.1, marketpress 188.8.131.52, and MarketPress Product Grid Shortcode Version: 0.3 only and removed/disabled my functions.php and custom mp_ template files.
I have the same result on my local site as on the "Live" site.
It seems that this is a theme issue. All pagetitles work correctly in twenty-ten and twenty-eleven, but the probelem described above occurs in twenty-twelve and twenty-thirteen. The CatchBox theme that I use has the same pagetitle mechanics as twenty-twelve and twenty-thirteen (using a filter create the title).
I have tried solutions similar to the filter issue fixes described in "https://premium.wpmudev.org/forums/topic/marketpress-231-generated-products-page-shows-no-title" but to no avail.
Surely there are websites using marketpress with twenty-twelve and twenty-thirteen themes successfully!
Any tips or solutions would be greatly appreciated.