This looks like a multi-page layout. Multi-page layouts are new in ArchiCAD 12, although they are only available for schedules and drawing indexes. (Your drawing looks neither of those...) Multi-page layouts have a different Navigator icon. You can control the multi-page behavior through the "Split Drawing among Multiple Layouts" checkbox, which is on the "Frame" Panel of Drawing Tool Settings. It would be interesting to see the status of that checkbox.
Gergely Kmethy
VP, Customer Success, Graphisoft