I'm a little behind with testing c2 releases but I've found an issue. Starting with 38.2 Sprites and TiledBackgound objects are not being drawn in the editor. But they are drawn just fine when running in the browser. Version 37 and earlier worked fine on my system.
This only occurs on Windows XP with my intel graphics card. My Vista system with an ati graphics card works fine.
I imagine the issue my be the intel graphics card, which is fairly old. Since 38.2 supports non power of two textures I tried power of two textures to see if maybe the intel chipset doesn't support non power of two, but the textures were still not drawn in the editor.
Here is my system and graphics card caps if it is helpful: http://dl.dropbox.com/u/5426011/c2/gpu_caps_viewer_report.xml