With the recent "security changes" from Instagram, causing all third party apps from being blocked from posting, we figured we’d recap at least two ways that we know of that still work. Think of these as your permanent fail-safes in case this is a prolonged outage or as a temporary solution until Daniel Gary (Instance) and others figure out a way around the problem.
To recap, using apps like Instance allows users to post to their Instagram account, but after about fifteen seconds, the image is deleted. That means somehow Instagram has flagged images uploaded by unauthorized apps in a clever way that has befuddled developers so far. But you can still post via other apps—one official, the other a hack.