I'm very sorry about this issue. I didn't find anything obviously wrong in the backup file(s) you sent, but I think I have an idea what caused the problem. The issue is already fixed from PowerTools 2010. I'm afraid the only way to avoid the problem in the future, is to start to use PowerTools 2010, the currently latest version is a test version Beta4 which can be downloaded from the Beta Testing section of this forum.
PowerTools 2010 will be offered as a free update to all existing customers, one reason is this: PowerTools 2009 contains a few bugs that shouldn't have been there, and we can't ask users money (upgrade fee) for fixing issues like this.