Pesky "Sections Breaks" in word doc

[Scarlet]

I've made this MS Word template file for one of my clients. I've inserted specific background images from file into the background in "Master Pages".



However, Every time I try to write sample text over the image in "Print Preview" it allows only one line of text, then inserts a Section Break which in turn, forces a new page.

I've tried deleting the Section Break in "Print Preview" (which you must do according to MS), but it simply deletes the all the content items including the page.

It seems to be the background image that's causing the problem. But why? I've "Sent it to Back".

Any help much appreciated.