I think I have solved the problem. Close down NT, grab a copy of v19, extract the files to somewhere, copy the 'templates' folder from the extracted location to the main NT location, in your document folder. Restart NT and and 'enable' sniper autotrader and, hey presto, it should now show the buttons.
For some reason, v28 does not included the 'templates' folder, where v19 does. Hope that helps.
SniperSlingshotv19.zip