Currently when you add a key between two existing keys (animation - doh), the tangent can behave rather "interesting". I looks like it aims at the pre-existing keys and doesn't align with the line as one would expect. I've seen a demo of maya where this is solved, which makes me think it should be in max too.
There might have been some double posting going on, but running a fever and trying to figure out the correct place to post, sorry.
Forums Links
Can't find what you're looking for? Ask the community or share your knowledge.