The one thing that causes long load times is embedded images. A ten page test file I have is 61 Kbytes with linked images, and it saves instantly. With the large images embedded, it is 293 Mbytes on disk and takes 25 seconds to save.
I have yet to come across a book that was too big to work on in PagePlus as a single file. BookPlus always increases the work load. Backups are vital however you work.
It is hard to guess what happened without all of the files. Perhaps you moved the chapters? It should be easy enough to recreate a new BookPlus file and link the chapters, but you say that BookPlus won't load. Its not an application — its just a dialogue in PagePlus that is used to collate the chapters. A BookPlus file is just an index of the linked chapters. This is the contents of a typical BookPlus file with three chapters:
Quote:
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<?xml version="1.0" encoding="UTF-8"?><SerifXML version="1.0"><chapters><_item _class="Chapter" RelativePath="PPX6\Tutorials\Changing Defaults.ppp" ModifiedTime="11/12/2011 11:58:24" SynchronizedTime="01/01/1970"/><_item _class="Chapter" RelativePath="PPX6\Tutorials\Adding Captions to Images PPX6.ppp" ModifiedTime="22/11/2011 10:19:17" SynchronizedTime="01/01/1970"/><_item _class="Chapter" RelativePath="PPX6\Tutorials\Advanced Typography.ppp" ModifiedTime="24/12/2011 18:38:10" SynchronizedTime="01/01/1970"/></chapters></SerifXML>
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There's nothing intrinsically wrong with using BookPlus if you want to do things the hard way. Its a legacy feature from the days when we could not mix page numbering styles and page orientation in a single publication. There are no longer any advantages to using it. Indexing is harder, editing is harder, finding your place is harder, and printing selected pages is harder.
Corrupt files are a potential problem with all of your eggs in one basket, but that is much less likely to happen if large images are linked.
To save a file for transfer to another PC, use Save as package... from the file menu — all linked graphics and fonts will be embedded in the package, and can be extracted on the target PC.