Users of many other iPhone applications have reported data loss problems after installing updates, and sadly, Stanza is no exception. This is a rare bug in Apple's iPhone/iPod operating system.

There is a procedure you can follow to prevent losing your Stanza library until Apple has resolved the issue. Note that this procedure works equally well for all iPhone applications, not just Stanza.

1. Back up your iPhone by syncing it with iTunes just before you install any update.
2. Disconnect your iPhone and install the update on the device.
3. If you didn’t lose your books, all is fine. If you did lose your library, you can restore it from the backup. But you have to be very careful. When you connect your iPhone to your computer, iTunes automatically overwrites the existing backup with a new one. Since you just lost your data on the device, this will effectively delete your previous backup from iTunes! To prevent this, you need to do the following:
1. Disable automatic syncing for your iPhone in iTunes’ preferences before you connect the iPhone again (iTunes > Preferences > Syncing > Disable automatic syncing for all iPhones and iPods).
2. Connect your iPhone and wait until it appears in iTunes’ sidebar. Since syncing is disabled, iTunes won’t back up your data automatically.
3. Right-click (or control click) on the iPhone and select “Restore from backup”.