PS: but anyway, i was not seeing even your template Heart sprite.
Lets try to reproduce all this stuff:
1) I open the level, erase it. It is empty now.
2) Select DemoCameraSpriteCollection, open editor, go to Settings, make sure that "Use tk2dCamera" is set.
3) Create/tk2d/Camera. Its position (0,0,-10).
4) Now Camera/Create Anchor. Leave everything as it is (UpperLeft, Offset(0,0), tk2dCamera).
5) Create/tk2d/Sprite. Sprite is parented to Anchor. Set Collection to DemoCameraSpriteCollection. Sprite is HeartEmpty.
Looking like thats it. Trying to build... Looking like it works, that's pretty good.
6) Change Ahcnor settings to Middle Center.
7) Create/tk2d/Animated Sprite. Select my Anim Lib.
Running...
...
...
voila, it works 0_0
My only assumption is that at yesterday night, probably, i moved camera.. but as far as i remember, i set all sprite positions to (0,0,0) and parented them to anchors. Anchors was at correct places, but, probably, i moved a camera... Though, why i started to move a camera? Probably, it was something wrong before...
Anyway, my next step is to create some more animations, so, if i'd face this problem again, or if i'd have some thoughts on it, i'll report it here.