I produced two different mail merge forms, one a letter and the other an 
envelope. I used the same data from a spread sheet with over 100 names and 
addresses. All files were OOo file formats. After the merge, I saved the 
merged document as a single, multi-page file. However, the paragraph 
properties of the first paragraph of every page had a check mark in the block 
to insert a blank page in front of it. So my 100 page merge contained 199 
pages and the print preview showed that every other page was a blank page.

I found no easy way to remove the paragraph formating except to edit the first 
paragraph of each page individually.