Not sure the exact curl command being used but was able to create an empty Glass Table using the following on ITSI v4:
curl -k -u admin https://localhost:8089/servicesNS/nobody/SA-ITOA/itoa_interface/glass_table -H "Content-Type:application/json" -X POST -d '{"_owner": "admin","title": "test_API_glass_table","description": "test_glass_table","object_type": "glass_table","latest": "now","latest_label": "now","svg_coordinates": {"viewdy": 0, "viewdx": 0}, "is_epoch": "false", "templateSwappableServiceIds":[]}'
Don't know if this helps.
... View more