GL_TEXTURE_COORD_ARRAY on OS X 10.6.8

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> I'm developing a JOGL application on a Macbook Pro (10.7.3, nVidia GeForce
> 330m).  I'm using the OpenGL 2.1 profile.  I recently checked out my source
> tree on my other computer, an iMac (10.6.8, ATI Radeon HD 5750).  For some
> reason, texture coordinates set via VBO ( GL_TEXTURE_COORD_ARRAY enabled;
> texture coordinate pointer set with glTexCoordPointer) work perfectly on the
> laptop, but not on the desktop. On the desktop, quads are drawn but they are
> solid-colored (presumably the color of whatever pixel is at (0,0) in the
> texture image. Immediate mode works as expected on both platforms.
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> Any ideas why this might be happening?