Creating a new theme is lost once the editor is restarted

Creating a theme is undone when restarting the editor. The .json file seems to become disassociated from the editor, the theme is reset back to the previous theme, and the new theme isn't available in the drop down for selecting a theme.

1. Create or open any project
2. Open Editor Preferences then navigate to the General/Appearance
3. Next to 'Active Theme' select the 'Duplicate.. ' button
4. Change Background R to 1.0 then save the theme
5. Restart the Editor(Theme is no longer active)
6. Open Editor Preferences then navigate to the General/Appearance
7. Select the drop down next to 'Active Theme'

Expected Results:
The red background theme is active, and available in the drop down.

Actual Results:
The theme is reset to the previous theme(dark), and our red background theme is not available in the drop down. The .json file is present where ever you saved it.

[UE-23848] Bug Status

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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