glReadPixels not working when reading from a FrameBuffer

I have an Intel HD 4600 Notebook with the latest Drivers (10.18.10.3960 29/9/2014) running on Windows 8.1 64bit. 

I am writing an OpenGL application which needs to read pixels from a Framebuffer.  The Intel Driver reports an OpenGL error 1282 and fails to read.  I have tried different formats (GL_FLOAT and GL_UNSIGNED_BYTE etc), but all fail.  I believe the code is OK as the same code works fine on NVIDEA and AMD hardware.

NOTE The glReadPixels works OK if I am reading from the GL_BACK buffer and only fails if I attempt to read from another buffer.

Is this a Driver Bug or am I doing something wrong??  Any assistance to get this working appreciated.

Some code below...

Setup the Frame Buffer

   // Create the FBO

      glGenFramebuffers(1, @fFBOHandle);

      glBindFramebuffer(GL_FRAMEBUFFER, fFBOHandle);

  // Create the texture object for the primitive information buffer

      glGenRenderBuffers(fColBufSize, @fColorBuffer[0]);

      for I := 0 to fColBufSize-1 do

      Begin

        glBindRenderBuffer(GL_RENDERBUFFER, fColorBuffer[I]);

        glRenderBufferStorage( GL_RENDERBUFFER, GL_RGBA32F,  SizeX, SizeY );

        glFramebufferRenderBuffer (GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + I, GL_RENDERBUFFER, fColorBuffer[I] );

        fBuffer[I] :=  GL_COLOR_ATTACHMENT0 + I;

      end;

  // depth

      if fIncDepthBuffer then

      Begin

        glGenRenderBuffers(1, @fDepthBuff);

        glBindRenderBuffer(GL_RENDERBUFFER, fDepthBuff);

        glRenderBufferStorage( GL_RENDERBUFFER, GL_DEPTH_COMPONENT24,  SizeX, SizeY );

        glFramebufferRenderBuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fDepthBuff);

      end;

      glDrawBuffers(fColBufSize, @fBuffer[0]);

  // Verify that the FBO is correct

      aStatus := glCheckFramebufferStatus(GL_FRAMEBUFFER);

      CheckForGLErrors('Float Buffer Set Size');

  // Restore the default framebuffer

      glReadBuffer(GL_NONE);    //for older hardware

      glBindRenderbuffer(GL_RENDERBUFFER, 0);

      glBindFramebuffer(GL_FRAMEBUFFER, 0);

Read the Pixels from the FramBuffer.  The PixelID is a local array and X,Y is the mouse location.

      glBindFramebuffer(GL_READ_FRAMEBUFFER, fFBOHandle);

      glReadBuffer(GL_COLOR_ATTACHMENT0);

      glReadPixels(x, y, 1, 1, GL_RGBA,   GL_FLOAT, @PixelID[0]);

      glReadBuffer(GL_NONE);