Same here on 1.10, clicking on "edit tank" and nothing happens. Tried it on a bunch if different tanks and the "edit tank" button had no effect on any of them. I am admittedly running a bunch of mods that don't officially support 1.10, so I wouldn't be surprised if it's a mod conflict causing the problems, but it worked before the last mod update, so something seems to have changed with this update.
Here is a copy of my player.log.