Reference Open bridge model Problem

Hi 

I am referencing in OBM model of a bridge into another file. However I notice that I am no longer able to see the bridge components in the open bridge model tab in the explorer tab in home ribbon.

I sometimes encounter error that active bridge is not selected but if I have those details shown up in the explorer, I can activate the right unit to do plan production.

I have 3 bridge units in my  model, I would have to switch between units when I am trying to do plan production. I m unable to do these selections since I m unable to see open bridge model details in the explorer.

Please help me. I m using the latest version of OBM.

Thanks,

Sukrit