(I've had three different people tell me that this has happened to them lately, so I'm just forewarning everyone who doens't know about this. Personally I don't like putting function overrides in the user layer because of this.)
And some suggestions from
kunzite1:- Keep a local copy on your hard drive! ... edit in your text editor, save, copy and paste into the advanced customization center, compile. if errors, fix in the text editor, save again, re-compile. This way if it happens to erase because of something you did, you have a backup to restore it with.
- When you delete a style, it will also **delete the layers that were attached to it**. You need to edit the style, change the theme layer and user layer to blank, save the style, *then* delete the style.