In Mac, I have an object. It has a texture mapped to it (JPEG). The problem is that I can only see the textured object when I render the scene. Before rendering, I only see the plain grey object. This has never happened before and I'm wondering if I inadvertently hit a key that turned something off. Any assistance is greatly appreciated.
Make sure your viewport is in hardware textured mode--press '6' on the keyboard. Then make sure that the material actually has hardware texturing enabled, and the appropriate channel is selected (in the 'Hardware Texturing' section of the material's attribute editor).