Frequently I get tripped up when I’m trying to pan on my iPad, because one of my fingers accidentally starts on a tool button or its label. The finger that’s on the button is disregarded, so the entire gesture is interpreted as a a one-finger drag (orbit) instead of a two-finger drag (pan). It took me a while to figure out that this was what was happening, but it happens a lot, and it’s annoying to recover from because it only takes a tiny accidental orbit to completely throw off my orientation.
I can’t think of a reason I would ever intentionally drag a button, or tap both button and canvas simultaneously. Could this behavior be changed so that two fingers placed anywhere on the main view — not just on the canvas — can initiate a pan motion? A small change that would save much aggravation!