Have doc on 8.5x11" paper with 0.25" margins all around. Save it with LibO 3.5.0 Beta 2. Open it with LibO 3.4.4. Margins in the latter are suddenly 0.79 on the left, 0.00 on the right, 0.79 on top and 0.79 on bottom. Yuck!
Known problem from "Bug 43862 - Page FORMATTING: Margin settings information not compatible with 3.4.4" @Jonathan Kamens: Thank you for your attention! *** This bug has been marked as a duplicate of bug 43862 ***