Going over the new features for 4.15 and I noticed that adjusting the transform of the keys in Sequencer, causes them to change to a linear interpolation. This is also effected if you select Transform through the Select/Edit Option menu in Sequencer and adjust the transform from there.

Workaround Right click the key and select Cubic (auto) again to set the interpolation back to default

Steps to Reproduce
  1. Open any project
  2. Create a new Level Sequence
  3. Add a cube to the level sequence at transform X:0 Y:0 Z:0
  4. Set the transform key at 0 in the sequence
  5. Scrub to 30 and set the transform to X:0 Y:210 Z:180 and add a key
  6. Scrub to 60 and set the transform to X:0 Y:410 Z:0 and add a key
  7. Select all 3 keys and hit Ctrl M
  8. Press the + in the transform option UI that appeared when Ctrl M was pressed

Result: The interpolation of the keys changes to Linear, but the UI remains Cubic

Expected Result: The interpolation does not change in the sequence

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There's no existing public thread on this issue, so head over toAnswerHub just mention UE-39923 in the post.

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ComponentTools - Sequencer
Affects Versions4.15
Target Fix4.15
Fix Commit3252385
Main Commit3389599
Release Commit3252385
CreatedDec 19, 2016
ResolvedJan 10, 2017
UpdatedApr 27, 2018