ThingFish,
This is a bug in the current version.
Here is a temp solution.
Create a new style sheet file, name it bgcolor.css.
In the bgcolor.css file, paste the following code into it:
BODY {
BACKGROUND-COLOR: #ffffff;
}
Then append it to the EditorWysiwygModeCss property.
editor.EditorWysiwygModeCss = "example.css,bgcolor.css"
Hope it helps.
Let me know if you have any further questions.
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