This is not reproduced in Shadow Color section.
Since ShadowColorAndOpacity is FLenearColor and ColorAndOpacity is FSlateColor, this prevents adding new keys in
ColorPropertyTrackEditor.cpp 
FColorPropertyTrackEditor::GenerateKeysFromPropertyChanged
by selecting DefaultGeneratedKeys instead of NewGeneratedKeys when the color type is FSlateColor (ChannelName = 0x0000000015d287d8 "SpecifiedColor")
Then the keys are not added.
1) Create a Text in UMG Widget
2) Create new widget animation
3) Select Autokey, try to change ColorAndOpacity in Text widget.
Expected: Color is changed and new keyframe in the new track is made.
Result: Color is changed, no keyframe in new track and soon the change is reverted.
Head over to the existing Questions & Answers thread and let us know what's up.
| 2 | 
| Component | UE - Anim - Sequencer | 
|---|---|
| Target Fix | 4.16 | 
| Fix Commit | 3299524 | 
|---|---|
| Main Commit | 3617655 | 
| Created | Feb 7, 2017 | 
|---|---|
| Resolved | Feb 13, 2017 | 
| Updated | Apr 27, 2018 |