Windows 7 64 Bits, Intel Core i7 2600K, GTX 580 + GTX980Ti
Broken: 2.77, 279
Worked: Never as far as I noticed
Short description of error
Viewport preview for 'Generated' type of texture coordinates seems broken for Bezier curve objects only
This may well be a limitation of the current system and not a bug per-se
Exact steps for others to reproduce the error
Create a new Cycles node material and assign it to both any bezier curve and mesh object simultaneously
Add a new Input >Z Texture Coodinates node and any type of texture (procedural or image based)
Connect the Generated output socket of the Texture Coodinates either directly to the shader color or feed it as texture coodinates to the texture.
Both will preview fine in the viewport for the mesh object, but fail on the bezier curve
Note that both render fine with cycles, this is only a OpenGL viewport issue, and might as well just be a limitation of the current system, rather than a bug, I don't know enough to tell.