Unable to open photos in preview

Hi,
I recently had to restore my MacBook Air (Dec 2010 running OS X 10.7.5 Lion) as it nearly ran out of memory and then refused to switch on at all.
I have subsequently had issues loading iPhoto (it doesn't load at all, so I've posted a separate discsussion on this).
However, through trying to check my user settings, I've noticed something very odd.
I can't seem to open any photos or pdf files etc in Preview at all.
I get the message "The file "xxxxx" couldn't be opened because you don't have permission to view it".
Now I've checked each file and I do have the correct permissions to open them, so something has clearly gone wrong here!
I have also tried running Disk Utility .... I click on "Macintosh HD"
If I then click "Verify Disk Permissions", I then see the message "Verify permissions failed: Insufficient privileges".
Now i am logged in as the administrator, so I should have full access to everything surely?
Can anyone suggest how I can fix this?

Gadget_Girl:
Welcome to the Apple Discussions. I get that sometimes and it seems to correct itself after letting it along for a bit. I've also closed iPhoto and restarted and it went away. Why it takes so long for iPhoto to fully establish some photos in the library is beyond me but some make it that way. I've always been able to get them to finally work. If you're the type to not shut down the computer but just sleep it, try rebooting, open iPhoto and try again.
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto (iPhoto.Library for iPhoto 5 and earlier) database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've created an Automator workflow application (requires Tiger or later), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 6 and 7 libraries and Tiger and Leopard. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.≤br>
Note: There now an Automator backup application for iPhoto 5 that will work with Tiger or Leopard.

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Process:
Preview [1255]
Path:
/Applications/Preview.app/Contents/MacOS/Preview
Identifier:
com.apple.Preview
Version:
5.0.3 (504.1)
Build Info:
Preview-5040100~2
Code Type:
X86-64 (Native)
Parent Process: launchd [112]
Date/Time:
2012-11-12 22:56:22.392 -0600
OS Version:
Mac OS X 10.6.8 (10K549)
Report Version: 6
Interval Since Last Report:
271423 sec
Crashes Since Last Report:
9
Per-App Interval Since Last Report: 8393769 sec
Per-App Crashes Since Last Report:   2
Anonymous UUID:
0F3586A7-CAE1-46A2-ABC6-93B2AE5BC86A
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000052b84faf0
Crashed Thread: 2 Dispatch queue: com.apple.root.default-priority
Thread 0: Dispatch queue: com.apple.main-thread
0   libSystem.B.dylib
0x0000000100b40d7a mach_msg_trap + 10
1   libSystem.B.dylib
0x0000000100b413ed mach_msg + 59
2   com.apple.CoreGraphics
0x0000000103069230 _CGSSynchronizeWindowBackingStore + 97
3   com.apple.CoreGraphics
0x000000010304eda9 _CGSLockWindow + 4515
4   com.apple.CoreGraphics
0x000000010305593f CGSDeviceLock + 535
5   libRIP.A.dylib
0x000000011b6dbe7b ripd_Lock + 46
6   libRIP.A.dylib
0x000000011b6e21f9 ripl_BltImage + 294
7   libRIP.A.dylib
0x000000011b6e1e61 ripc_RenderImage + 323
8   libRIP.A.dylib
0x000000011b6e4c64 ripc_DrawImages + 7966
9   com.apple.CoreGraphics
0x000000010306f63d CGContextDrawImages + 228
10 com.apple.coreui
0x00000001065dd316 CUIRenderer::DrawWindowFrameDark(CUIDescriptor const*) + 4990
11 com.apple.coreui
0x00000001065dfc77 CUIRenderer::Draw(CGRect, CGContext*, __CFDictionary const*, __CFDictionary const**) + 4787
12 com.apple.AppKit
0x0000000101abb516 _NSDrawThemeBackground + 1111
13 com.apple.AppKit
0x0000000101abafe3 -[NSThemeFrame _drawUnifiedToolbar:] + 916
14 com.apple.AppKit
0x0000000101aba6b8 -[NSThemeFrame _drawTitleBar:] + 604
15 com.apple.AppKit
0x0000000101aba3f9 -[NSThemeFrame drawFrame:] + 947
16 com.apple.AppKit
0x0000000101ab9f80 -[NSFrameView drawRect:] + 773
17 com.apple.AppKit
0x0000000101ab96e9 -[NSThemeFrame drawRect:] + 109
18 com.apple.AppKit
0x0000000101ab8d75 -[NSView _drawRect:clip:] + 3566
19 com.apple.AppKit
0x0000000101ab654b -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectFor View:topView:] + 2112
20 com.apple.AppKit
0x0000000101ab5b2c -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectFor View:topView:] + 254
21 com.apple.AppKit
0x0000000101ab23de -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2683
22 com.apple.AppKit
0x0000000101a2bc0e -[NSView displayIfNeeded] + 969
23 com.apple.AppKit
0x0000000101bdcf09 -[NSControl drawCell:] + 82
24 com.apple.AppKit
0x0000000101bdc7a4 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 1548
25 com.apple.AppKit
0x0000000101bdbdbf -[NSSegmentedCell trackMouse:inRect:ofView:untilMouseUp:] + 1303
26 com.apple.AppKit
0x0000000101bdb2f5 -[NSControl mouseDown:] + 624
27 com.apple.AppKit
0x0000000101af53a7 -[NSWindow sendEvent:] + 5409
28 com.apple.AppKit
0x0000000101a2aafa -[NSApplication sendEvent:] + 4719
29 com.apple.Preview
0x000000010000290c -[PVApplication sendEvent:] + 357
30 com.apple.AppKit
0x00000001019c16de -[NSApplication run] + 474
31 com.apple.AppKit
0x00000001019ba3b0 NSApplicationMain + 364
32 com.apple.Preview
0x0000000100001454 start + 52
Thread 1: Dispatch queue: com.apple.libdispatch-manager
0   libSystem.B.dylib
0x0000000100b59c0a kevent + 10
1   libSystem.B.dylib
0x0000000100b5badd _dispatch_mgr_invoke + 154
2   libSystem.B.dylib
0x0000000100b5b7b4 _dispatch_queue_invoke + 185
3   libSystem.B.dylib
0x0000000100b5b2de _dispatch_worker_thread2 + 252
4   libSystem.B.dylib
0x0000000100b5ac08 _pthread_wqthread + 353
5   libSystem.B.dylib
0x0000000100b5aaa5 start_wqthread + 13
Thread 2 Crashed: Dispatch queue: com.apple.root.default-priority
0   com.apple.Preview
0x000000010002c056 -[PVIVImageTile _scaleLevel:intoLevel:onOperation:] + 1360
1   com.apple.Preview
0x000000010001edd6 -[PVIVImageTile loadLevel:onOperation:] + 195
2   com.apple.Preview
0x000000010001ec8f -[PVIVImageTileLoadOp main] + 46
3   com.apple.Foundation
0x0000000101129dd0 -[__NSOperationInternal start] + 681
4   com.apple.Foundation
0x0000000101207bd5 ____NSOQSchedule_block_invoke_2 + 129
5   libSystem.B.dylib
0x0000000100b7cd64 _dispatch_call_block_and_release + 15
6   libSystem.B.dylib
0x0000000100b5b2d1 _dispatch_worker_thread2 + 239
7   libSystem.B.dylib
0x0000000100b5ac08 _pthread_wqthread + 353
8   libSystem.B.dylib
0x0000000100b5aaa5 start_wqthread + 13
Thread 3: Dispatch queue: com.apple.root.default-priority
0   com.apple.CoreGraphics
0x0000000103039775 CGRectEqualToRect + 580
1   com.apple.CoreGraphics
0x0000000103033c01 bindDisplayMapping + 414
2   com.apple.CoreGraphics
0x000000010303931d updateAllDisplayInfoAsNeeded + 227
3   com.apple.CoreGraphics
0x00000001030391c3 CGSGetNumberOfDisplays + 32
4   com.apple.opengl
0x000000010023a6f1 CGLGetPixelFormatRetainCount + 293
5   com.apple.opengl
0x0000000100232549 CGLChoosePixelFormat + 132
6   com.apple.AppKit
0x0000000101a6fbe7 createPixelFormat + 53
7   com.apple.AppKit
0x0000000101a6fb7d -[NSOpenGLPixelFormat initWithAttributes:] + 80
8   com.apple.Preview
0x00000001000138b1 +[PVIVImageView defaultPixelFormat] + 56
9   com.apple.Preview
0x0000000100023cba -[PVIVGLContextPool _lockedContextPoolItem] + 255
10 com.apple.Preview
0x0000000100023bac -[PVIVGLContextPool lockedGLContext] + 16
11 com.apple.Preview
0x000000010002bb54 -[PVIVImageTile _scaleLevel:intoLevel:onOperation:] + 78
12 com.apple.Preview
0x000000010001edd6 -[PVIVImageTile loadLevel:onOperation:] + 195
13 com.apple.Preview
0x000000010001ec8f -[PVIVImageTileLoadOp main] + 46
14 com.apple.Foundation
0x0000000101129dd0 -[__NSOperationInternal start] + 681
15 com.apple.Foundation
0x0000000101207bd5 ____NSOQSchedule_block_invoke_2 + 129
16 libSystem.B.dylib
0x0000000100b7cd64 _dispatch_call_block_and_release + 15
17 libSystem.B.dylib
0x0000000100b5b2d1 _dispatch_worker_thread2 + 239
18 libSystem.B.dylib
0x0000000100b5ac08 _pthread_wqthread + 353
19 libSystem.B.dylib
0x0000000100b5aaa5 start_wqthread + 13
Thread 4:
0   libSystem.B.dylib
0x0000000100b5aa98 start_wqthread + 0
Thread 5:
0   libSystem.B.dylib
0x0000000100b5aa98 start_wqthread + 0
Thread 2 crashed with X86 Thread State (64-bit):
rax: 0x0000000108b1a070 rbx: 0x0000000108ba7a80 rcx: 0x0000000000000018 rdx: 0x0000000108be7930
rdi: 0x0000000000000000 rsi: 0x0000000108bf0a80 rbp: 0x000000011d3ddd20 rsp: 0x000000011d3ddbf0
   r8: 0x0000000000000001   r9: 0x0000000000000000 r10: 0x0000000108bc5b70 r11: 0x0000000000000004
r12: 0x0000000108ba7a80 r13: 0x000000010a0e0ed0 r14: 0x0000000000000002 r15: 0x00000001012c839c
rip: 0x000000010002c056 rfl: 0x0000000000010246 cr2: 0x000000052b84faf0

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