I don't know what kind of content or how much you're trying to export, but in our users group meeting last week we came up with a crazy workaround after we couldn't get transmogrifier to work.
I need to move a folder from Plone 4.3.2 to Plone 5 site. The folder had Archtypes and Dexterity content types and custom views. We exported the folder (.zexp), imported it into local vanilla Plone 4.3.2, then disabled workflows, content rules, and custom views. Then we took the data.fs and blobstorage, put them into a local vanilla Plone 5 site and migrated the site to Plone 5. Then we exported the folder and imported it into the site it needed to be in. The custom views were copy and pasted and the Dexterity content types were exported and imported directly, without issues.
Probably not relevant to what you're trying to do, but maybe this will help somebody else.