--- Operating System, Graphics card ---
Windows 64-bit, AMD Radeon HD 7700
--- Blender version with error, and version that worked ---
r53402 has the error. It would appear that no version correctly displayed multi-UV node materials, though Blender 2.65a displays both textures with one of them using the wrong UV layout.
--- Short description of error ---
When using node materials, it appears to force the materials or textured inside of the node setup to use the active UV coordinates rather than the ones specified per material or in the node setup. As of a recent build (as can be seen above) it also seems to be influencing the textures' visibility, as one of the textures doesn't even appear with the node setup.
--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
Take note of the way the node setup shows the texture in the 3D view and then press P to see it change. One texture (the brick texture) takes on the second (active) UV map, despite specifically using UV1 in the node setup, and the other texture disappears completely as of r53402.