The arrows to create subtasks seem to be missing now. I can no longer figure out how to "indent" a task to make it a subtask.
Which view are you trying to change the indent level? On date based views (such as Today) this can't be changed. When creating a task, or editing within a Project, they will be at the right hand side, but you can also use CTRL+RightArrow (or left arrow) to change the indent level.