Missing flows for inline structure flow hydrographs

Greetings

I am having a problem viewing the results of Inline Structures flows. When I open the Stage and Flow Hydrographs for any of my inline structures I only get the stage information. The gate settings and flows are shown as Missing Data (see attached).

I have never encountered this problem in my previous models. I have no problems seeing flows hydrographs for my cross-sections and bridges.

Some notes on my model:
- using HEC-RAS 3.1.3 (geometry was developed in 4.0)
- using metric units
- Inline structures were imported from HEC-GeoRas - (could it be a naming problem??)
- Unsteady flow modeling (dam break modeling)

If anyone has encountered this problem before, any advice/help would be greatly appreciated.

Cheers
Patrick