Switching Themes, momentarily backgrounds are not included. Any background from a former Theme stays visible.
Since the Editor Fixed Width background or the Composition Mode background seriously impact the effect of a Theme, updating the background is essential to the updated look of the application.
Currently the Theme’s manifest XML-file states: <preferences load=“Colors”>ThemeName.prefs</preferences>, indicating only Colors are imported. while even the saved Theme Options contains “FullScreen\Colors\BackgroundImage” as a ByteArray, and the “TextEditing\Colors\MainEditorFixedWidthBackgroundImage” as a ByteArray.
Extending the Load action in the Theme XML to the background images would make for a more impressive and more logical switching of Themes.