Changing your theme will unfortunately trample over your logon background.
Due to the number of different resolutions out there, you may have issues changing the logon background image. The supported resolutions follow:
768x1280, 900x1440, 960x1280, 1024x768, 1024x1280, 1280x960, 1280x768, 1280x1024, 1360x768, 1440x900, 1600x1200, 1920x1200
If you don't see your resolution in the preceding list, rest assured there's a failsafe. Simply rename your image to "backgroundDefault.jpg," and you'll be good to go. Keep in mind, however, your image may be resized, stretched, or otherwise distorted to fit your weird resolution.
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