colored text+Link to screencast of repro steps: +
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-May take some clicking around even between windows
-Will not save after this
-Does not affect 4.16

Steps to Reproduce
  1. Create a new Unreal 4.17.2 project, using the C++ Basic Code template, Desktop / Console, Maximum Quality, and With Starter Content
  2. Under the plugins menu, choose the "Actor Sequence Editor (Experimental)" plugin, enable it, and restart the engine as prompted
  3. Save a new Map, called TestMap
  4. Create a new Actor Blueprint, SequenceTester_BP
  5. Place an instance of SequenceTester_BP into the map
  6. Open the Blueprint Editor for SequenceTester_BP
  7. Add an Actor Sequence Component to the blueprint
  8. Add a Static Mesh Component to the blueprint and set it's Static Mesh to 1M_Cube
  9. Select the Actor Sequence Component, open the Sequence Editor, and add a Transform track for the Static Mesh
  10. Add a Location Key (0,0,0) at t = 0 and (100,100,100) at t = 1
  11. Play the animation in the Blueprint Editor
  12. Move the instance of the blueprint in the map a few units along the Y-Axis (or do any other action to mark the scene dirty)
  13. Attempt to save your map – you should now see the error message

Expected: The files will save without errors
Results: The files will not save and there will be an error message

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ComponentTools - Sequencer
Affects Versions4.17.24.19
Target Fix4.18
Fix Commit3677446
Release Commit3677446
CreatedSep 28, 2017
ResolvedOct 3, 2017
UpdatedApr 27, 2018