Why are there black blocks in my iPhone camera roll / photo library?
Many of you have written concerning an issue where portions of your camera roll and/or photo library on your are affected by "black blocks" after upgrading to iOS 4.x.
This seems to be caused by a sync error, and can usually be resolved by taking the following steps:
1) Connect your iPhone to your PC
2) Uncheck the option to Sync photos in iTunes
3) Sync your iPhone
4) Recheck the option to Sync photos in iTunes
5) Sync your iPhone
If this does not resolve the issue, you may additionally need to delete all the photos from your camera roll before resyncing. Be sure to import any photos in your camera roll that you want to save to your PC before deleting them on your phone.