Here are some of the message created surrounding the iphoto faces window fractal redraw problem
8/23/11 9:34:21.947 PM Backup Engine: MaxBack Engine MaxBackEngineController-- MoreSecCopyHelperToolURLAndCheckBundled #1
8/23/11 9:34:21.960 PM Backup Engine: MaxBackEngineController-- calling MoreSecExecuteRequestInHelperTool
8/23/11 9:34:21.961 PM Backup Engine: MaxBackEngineController-- back from MoreSecExecuteRequestInHelperTool
8/23/11 9:34:21.961 PM Backup Engine: MaxBack Engine Error: An error occurred: 0xffffec78 (-5000)
8/23/11 9:34:25.139 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/23/11 9:34:25.687 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/23/11 9:34:29.081 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/23/11 9:34:29.088 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/23/11 9:34:29.674 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
......
8/23/11 9:34:31.876 PM com.apple.loginwindow: server
8/23/11 9:34:31.928 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/23/11 9:34:31.935 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/23/11 9:34:31.965 PM [0x0-0x1a01a].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
.....
8/24/11 9:44:45.372 PM com.apple.backupd: Post-back up thinning complete: 1 expired backups removed
8/24/11 9:44:46.304 PM com.apple.backupd: Backup completed successfully.
8/24/11 9:45:36.529 PM [0x0-0x1a01a].com.apple.iPhoto: CoreAnimation: rendering error 506
8/24/11 9:45:36.533 PM [0x0-0x1a01a].com.apple.iPhoto: CoreAnimation: rendering error 506
8/24/11 9:45:36.558 PM [0x0-0x1a01a].com.apple.iPhoto: CoreAnimation: rendering error 506
8/24/11 9:45:36.575 PM [0x0-0x1a01a].com.apple.iPhoto: CoreAnimation: rendering error 506
......
8/24/11 9:46:02.170 PM com.apple.launchd.peruser.501: ([0x0-0x1a01a].com.apple.iPhoto[294]) Job appears to have crashed: Bus error: 10
8/24/11 9:46:20.027 PM [0x0-0xc70c7].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/24/11 9:46:21.132 PM [0x0-0xc70c7].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
8/24/11 9:46:33.294 PM [0x0-0xc70c7].com.apple.iPhoto: ImageIO: <ERROR> CGImageSourceGetType image source parameter is nil
besides the last instance, the problem with picture drawing appears after time machine backup.