Short description of error
Normal map in both versions utilises Generated cube mapping.
2.77: Normal map provides this result without adding UV map (well, not the best but good enough)
2.78c (020bbbb): Normal map is not working without creating UVmap (pic1), but if you add UVmap through the plus button it appears rotated(pic2).
All is fine with properly made UV unwrapping (default Cube projection)
Exact steps for others to reproduce the error
- Open file in 2.78c, render viewport -> no map
- Push plus sign to add UVmap -> strange map
- Unwrap in edit mode with Cube projection -> working OK