VBO and VertexPointer Issues

Hi There,
Don’t known if this is a beginner or advanced question so bare with me if I did not enter this question in teh beginner section.
I am trying to mix displaying objects with VBOs and vertex arrays (glVertexPointer…) and can only see the VBOs based objects. Either one or the other is fine but not both at the same time (i.e. in the same frame draw). Is there some incompatibility between these 2 approaches.
Note on the system : MAC OS 10.6.3 macbook pro Nvidia 330M graphic card (lastest macbook pro)

Thanks for any help in figuring this out.

Can you post some code?