Best Answer Simon_P , 24 May 2013 - 11:05 PM
Enabling debug will NOT affect css in anyway.
Every time you enable/disable it you are saving the settings and recompiling the css.
So you might as well leave that turned off You probably have a typo in your custom css and when you save it with the typo it is loading a backup.
So to start off, please paste us any custom less/css you are using, if its more than a few lines please please please use a paste service.Go to the full post