I’m troubleshooting this same problem. I’ve got 2 sites. The first I upgraded from 1.1 to 1.2 and the submissions show. On the second site which is a work site I did a clean install of 1.2 and the subs are either invisible or not present.
On the dashboard of the plugin the forms, pages etc fields are also completely blank – on the site where the plugin is working, these register even with no submissions.
I’ve deactivated (not deleted) all other plugins and no joy.