Stamp Album Pro is free to use with some limitations. A premium account is available for $10 per year.
Because of the file size and system resources used, 50 stamps is the maximum per document.
It is probably because the next stamp in the layout was a large setenant set or tall stamp. If a stamp is too big for the available area, a new page is automatically created. Try redoing the page without the stamp and creating a seperate page with just the setenant set. With a block of stamps, there ususally is enough history that you could go to wikipedia.org and create a really nice page layout with the story of the stamps.
Since this is a database driven application, by registering it is easier to catalogue, rate, and manage the pages you create. In addition it allows other users access to the pages created.
It was a choice, either to have text span multiple pages, or just to cut it off at the bottom of the page. You are creating a page to display a stamp, not writing a book. If you need that extra little room, try adjusting the font size, margins, padding, gutters, and header spacing. If that doesnt get you enough room, then try not being so verbose.
One of two reasons, either you saved the template, but did not save the page (thumbnails are associated with pages only), or you saved the page and the template and at a later date deleted the page, in which case the thumbnail was removed as well.
The database is thousands of entries long and sometimes I miss something or entered the data wrong. When a stamp comes out huge like that, that means there is a "0" size for the stamp and the image gets added at its actual size.
If this happens, simply contact me and I will fix it as soon as I can.
These documents detail how to use SAPro and are critical references for successfully creating album pages.