That is unfortunate to hear. Did you get any error messages while importing? Probably you don't have enable the console to show on any messages, so you didn't see any. Without more information it will be very hard for me to determine what is causing this error. Did you have any custom scripts in your sheet?
Could you send me the sheet or the .xfdf file you wanted to import?
EDIT: I just tested importing from a 'v12.26 Printer Friendly-Redesign' to a 'v12.75 Printer Friendly-Redesign' and all pages showed up, not just the first. Considering the fact that you are using v12.26, when the Revised Ranger was introduced, this could be very much related to that. If you do indeed have a revised ranger in v12.26, please try importing your character from a sheet where you deleted the Revised Ranger code from the "Add Custom Script" dialogue.
Anyway, the latest version has an essential fix for Wizards:
[H=6]Changelog for
MPMB's Character Record Sheet v12.76 (18 December 2016):[/H]
- Fix for wizard spells going missing from their spellbook upon re-generation of their spell sheets, if the spellbook contained more than 18 spells (thanks Vladimir S. for reporting).
Links:
MPMB's Character Record Sheet - Colorful A4/Letter MPMB's Character Record Sheet - Printer Friendly Redesign