Hi Doug,
I suspect the developer has inadvertently changed the Toolset > Settings > Paths to have the Models directory set to a specific model.ief directory instead of the directory containing all model.ief directories.
I was able to recreate the same behaviour by doing that.
Default models directory for Gen 8.6 is: C:\Users\USERID\Documents\CA\Gen 8.6\Models
I changed the Settings > Paths directory for Models to be for a sample model I have in that directory i.e. C:\Users\USERID\Documents\CA\Gen 8.6\Models\sample.ief
Now when I use the Toolset and use Open Model for the first time it does not allow me to choose the model and it automatically opens the sample model.
If I then used Open Model a second time it did show me directory C:\Users\USERID\Documents\CA\Gen 8.6\Models to choose the model from.
Hope it helps
Regards,
Lynn