Well, what you aren't understanding here, is that it TOTALLY doesn't matter what happen to the objects that you export.
See, you "won't" be using those in your scenes.
All you are doing is making a "stand-in" object to make the Ivy on.
Once you have your ivy made, THATS all that you need.
You can toss the stand in object out for all it matters, except you 
will want it for any future experiments of course, but the point being, that you 
WILL NOT beingusing that object in your Poser scene or in any scene for that matter.
You could use them, but why?
If you already have a perfectly fine working Poser object or any 
other 3D object, why use some exported OBJ object for your scene?
You just don't need to.
I'm sure as heck not using the exported objects. 
I'm using the "original" Greek Ruins object in Poser and things are fine.
No need to use my exported objects.
You load in your Ivy and be on your way with your scene :)

Hope that clears that whole issue up about the triangulating objects and exporting 
and all that, they just are needed as stand in objects for a refference to make the ivy on.
Thats all :)

Enjoy!

...................................md :)

I'll post my sample scene later, but I'm done for the evening here :)
I just want to chill in front of the TV and doze off, now that I am nice and full from dinner :)