I have installed Appdaemon and am running HADashboard with custom skins. However, when I change the background image or edit the layout of the widgets, the change is not shown on the dashboard. I try to restart AppDaemon and HA but does not help. All I get is a white background and widgets in their original layout.
Try forcing a recompile of the dashboard by adding ?recompile=1 or &recompile=1 (depending on if you are specifying a custom skin in the url) to the end of your url in the browser.
Also clear the browser cache (CTRL+F5).
Pleae also post your custom skin yaml file, the part where you specifiy the background, if the above does not help.