UI operations in UIImageView+JMImageCache.m are being called outside the main thread.

[gilmorem]

UIImageView+JMImageCache.m
Lines: 62, 63

 [self setNeedsDisplay];
 [self setNeedsLayout];

These methods affect UI operations of UIView. They need to be called on the main thread. This is causing many problems including causing animations on UIViews to stop working. Especially when using JMImageCache within a dynamic tableView or collectionView cell/itemForRowAtIndexPath.

Fix:
Just like you do in the other part of this block...

 dispatch_async(dispatch_get_main_queue(), ^{
    [self setNeedsDisplay];
    [self setNeedsLayout];
});