I'm running a multi-site setup with Marketpress and paypal chained payments. For some reason, I just started getting the "Whoops, looks like you skipped a step! Please go back and try again." error. The system has been working great for the last few months, now out of nowhere it has stopped working.
I've read through all of the other posts on this issue and none of them fix my problem. I've even deactivated all plugins and set the theme to the default... still no go.
I'll get admin access to one of the core developers if I need to.
The site is http://cfai.co, we're running live right now.