I haven't noticed this before, so not sure if this is a new issue with the 4.2.2 version that installed this morning.

In the Mac client, I just tried to add a new subtask. At first I thought it just wasn't working at all, but I eventually found EXACTLY THE RIGHT PLACE TO CLICK with the mouse. Clicking the + doesn't work, nor does clicking anywhere in the "Add a subtask" text. The only place that works is RIGHT AT THE START of the text, to the left of the "A". Incredibly fiddly to find, and very unintuitive.

Compare this to the web version UI, where I can click anywhere on that row and be in edit mode for that subtask.

There doesn't even appear to be a shortcut key on the Mac client to add a subtask, so I'm stuck using the mouse. Very sad.