There seems to be a bug in Mathcad 4.0 where it just loses pagination and things creep above the page break line.
I've spent about an hour trying to fix a many page document only to hit save and they randomly creep up again.
Is there a solution for this?
Only just switched (permanently?) to 4.0. Haven't seen that yet. However, the prime GUI in general has many bugs. I think it gets confused with the various grid spacing options. So you might switch between those. But when you do it moves everything around.
Please send your issue to PTC's tech support by using "Mathcad Support Center" (you can do it, even if you use Express version of Mathcad Prime):
I believe that only Enterprise users can actually report a functionality issue. Other users seem to be limited to licensing and installation problem reports.