So I call this method:

-(void)beginExecution {
    NSOperationQueue *queue = [NSOperationQueue new];

    NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self
                                                                            selector:@selector(execute)
                                                                              object:nil];

    [queue addOperation:operation];
    [operation release];
}

Which triggers this:

-(void)execute {
    [[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"MyTexture.plist"];
    loaded = YES; // This tells me whenever loading is done.
}

However, when I create a sprite and try to use the texture MyTexture.png, the sprite is a blank canvas. Why is that?