+ Some corrections regarding the display and loading of attachments.

- Attachments are no longer displayed in a cell if the system indicates that they cannot be displayed.
- Fixed a bug that prevented devices running iOS6 from displaying attachments in the Overview List.

Classes/BITFeedbackListViewCell.m

@@ -210,7 +210,7 @@
     [imageView addTarget:self action:@selector(imageButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
     
     [self.attachmentViews addObject:imageView];
-    [self addSubview:imageView];
+    //[self addSubview:imageView];
     
     
   }
@@ -289,7 +289,7 @@
   for ( BITActivityIndicatorButton *imageButton in self.attachmentViews){
     imageButton.contentMode = UIViewContentModeScaleAspectFit;
     imageButton.imageView.contentMode = UIViewContentModeScaleAspectFill;
-    
+
     if ( !_message.userMessage){
       imageButton.frame = CGRectMake(FRAME_SIDE_BORDER + (FRAME_SIDE_BORDER + ATTACHMENT_SIZE) * (i%(int)attachmentsPerRow) , floor(i/attachmentsPerRow)*(FRAME_SIDE_BORDER + ATTACHMENT_SIZE) + baseOffsetOfText , ATTACHMENT_SIZE, ATTACHMENT_SIZE);
     } else {
@@ -297,7 +297,11 @@
     }
     
     if (!imageButton.superview){
-      [self addSubview:imageButton];
+      if (self.accessoryBackgroundView.superview){
+        [self insertSubview:imageButton aboveSubview:self.accessoryBackgroundView];
+      } else {
+        [self addSubview:imageButton];
+      }
     }
     
     i++;

Classes/BITFeedbackListViewController.m

@@ -637,7 +637,7 @@
     cell.labelText.delegate = self;
     cell.labelText.userInteractionEnabled = YES;
     cell.delegate = self;
-    [cell setAttachments:message.attachments];
+    [cell setAttachments:message.previewableAttachments];
     
     for (BITFeedbackMessageAttachment *attachment in message.attachments){
       if (attachment.needsLoadingFromURL && !attachment.isLoading){
@@ -812,12 +812,7 @@
   
   for (int i = 0; i<self.manager.numberOfMessages;i++){
     BITFeedbackMessage *message = [self.manager messageAtIndex:i];
-    for (BITFeedbackMessageAttachment *attachment in message.attachments){
-      if ([QLPreviewController canPreviewItem:attachment]){
-        [collectedAttachments addObject:attachment];
-
-      }
-    }
+      [collectedAttachments addObjectsFromArray:message.previewableAttachments];
   }
   
   self.cachedPreviewItems = collectedAttachments;
@@ -832,15 +827,20 @@
 
 - (id <QLPreviewItem>) previewController: (QLPreviewController *) controller previewItemAtIndex: (NSInteger) index {
   if (index>=0){
+    __weak QLPreviewController* blockController = controller;
     BITFeedbackMessageAttachment *attachment = self.cachedPreviewItems[index];
     if (attachment.needsLoadingFromURL && !attachment.isLoading){
       attachment.isLoading = YES;
       NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:attachment.sourceURL]];
       [NSURLConnection sendAsynchronousRequest:request queue:self.thumbnailQueue completionHandler:^(NSURLResponse *response, NSData *responseData, NSError *err) {
+        attachment.isLoading = NO;
         if (responseData.length){
           [attachment replaceData:responseData];
-          [controller reloadData];
-          [[BITHockeyManager sharedHockeyManager].feedbackManager saveMessages];
+          [blockController reloadData];
+          
+        [[BITHockeyManager sharedHockeyManager].feedbackManager saveMessages];
+        } else {
+          [blockController reloadData];
         }
       }];
       return attachment;

Classes/BITFeedbackMessage.h

@@ -83,5 +83,11 @@ typedef NS_ENUM(NSInteger, BITFeedbackMessageStatus) {
 
 -(void)addAttachmentsObject:(BITFeedbackMessageAttachment *)object;
 
+/**
+ * Returns an array of attachment objects that may be previewed on this device.
+ */ 
+- (NSArray *)previewableAttachments;
+
+
 
 @end

Classes/BITFeedbackMessage.m

@@ -90,6 +90,19 @@
     [attachment deleteContents];
   }
 }
+
+- (NSArray *)previewableAttachments {
+  NSMutableArray *returnArray = [NSMutableArray new];
+  
+  for (BITFeedbackMessageAttachment *attachment in self.attachments){
+    if ([QLPreviewController canPreviewItem:attachment ]){
+      [returnArray addObject:attachment];
+    }
+  }
+  
+  return returnArray;
+}
+
 -(void)addAttachmentsObject:(BITFeedbackMessageAttachment *)object{
   if (!self.attachments){
     self.attachments = [NSArray array];