Hi, I have had ongoing issues now with Marketpress on 2 identical sites,
http://ultimatesportsmemorabilia.com.au is one that just had an issue where the cart just stopped working. (http://licensedsportsmemorabilia.com.au/ is ok right now)
When a product was added to the cart, we could not get past the page where shipping details were entered, upon clinking checkout it would redirect back to the same shipping page.
I'm running 18.104.22.168 marketpress because everytime I update to 3.0.x the site totally breaks down. I get php memory limit problems. Happen about 4 times over past 6 months.
This is a previous problem site/issue when I was developing the 2nd site with all the same products.https://premium.wpmudev.org/forums/topic/white-screen-marketpress-cart-and-checkout-pages (I abandoned thisand started over as the speed on the site is terrible)
I have since restored the marketpress plugin back a few days, firstly after the failed updated, and secondly after the errors started to happen, even though there did not seem to be any file changes when looking at the plugin files via ftp. And now its working again, so makes it hard for you to identify anything.
I'm at a bit of a loss here on what to do, it seems like it can break at anytime and for a site getting up to 10 sales a day this is disconcerting.