Check what material is used for the glass.
Go to the Materials Dialog and you will see that for some reason a vectorial hatch is assigned to this material. If you modify this vectorial hatch to "background" then it should appear fine in the Schedule.
Edit: There seems to be a bug here. Even if I set the vectorial fill of the glass material to "background", the fill remains in the schedule. Maybe it gets stored in some cache or something and there it won't change.
The whole thing is rather random.
I found a workaround:
1. Go to the Scheme Settings Dialog and delete the 3D Front (or Back) View from the list of fields to be scheduled.
2. Click OK, generate the Schedule. No 3D Front or Back View appears.
3. Now go back to the Scheme Settings Dialog and re-add this field to be listed.
4. Generate the schedule and it should be fine.
It works for me. Of course all this after you set the vectorial fill for the glass materials back to "Background".
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