Curve editor thinks it's in mouse drag mode, can't play in editor

Steps to reproduce:

  1. Open curve editor
  2. Drag a key or curve handle
  3. While dragging with left mouse button, press right mouse button
  4. Key or handle jumps back to original location and mouse is released
  5. Click play
  6. Editor refuses to launch PIE, saying “Can’t play in editor when performing Mouse Drag operation”

This can be worked around merely by dragging a key or handle and releasing normally.

Hello wmassingham,

I was able to reproduce this issue on our end. I have provide a link to the public tracker below. Please feel free to visit the provided link for future updates. Thank you for your time and information.

Link: Unreal Engine Issues and Bug Tracker (UE-33993)

Make it a great day

Thanks for the fast action! Any chance I could get this report looked at too? It’s a much more aggravating issue…

This bug is back in 4.15

When using a “Runtime Float Curve Structure” variable this still produces the same bug in 4.22.2