Here are the steps you need.
1. Upgrade your InvisionBoard forum.
2. Download and save the attached text file. Rename it from upgradeib.txt to upgradeib.php
3. FTP this attached file upgradeib.php into your photopost directory.
4. Run the file in your browser http://www.domain.com/photopost/upgradeib.php
5 . Delete the file from your server
6. Log into Photopost. Thats It.
This FAQ assumes your integration with Invisionboard 1.3 was correct as far as cookies. The integration file is brand new and the only change needed is to point your install to using the new one. No other changes are necessary.