Stratix - Virtex2Pro Co-Simulation using modelsim !

Hi,
I am trying to simulate together a Stratix and a V2Pro design using
ModelSim.
Both the designs simulate correctly individually.
I use the Rocket IOs in the V2Pros so have set the modelsim.ini file
correctly.
The interesting thing is that in the co-simulation, all parts of the design
are ok except the
Rocket IO part which makes me think that it is probably due to the
Smartmodel interface
which i may not be correctly setting up.
When I simulate the Xilinx alone, while loading the design files in ModelSim
the first line I see is :

Loading C:/Modeltech_5.7f/win32/libswiftpli.dll

but i do not see such a line when running the co-simulation, which could
possibly be the reason for not seeing anything come out of the Rocket IOs in
the Co-Simulation.

Could anyone help with this ?
I will be grateful.
Thanks in advance,
adarsh