We have the Professional Edition of Salesforce and, although we followed the instructions provided by adding the new fields, one unexpected change on Jan 31st was the removal of the API that enabled data exchange between the two systems. Apparently Salesforce has backed off of it's open architecture stance and only offers this for versions above Professional. We've contacted them to allow us to reenable a SOAP API with no luck.
Has anyone else experienced this issue? If so, any workarounds other than upgrading to the Enterprise Edition of Salesforce?