What type of license you've got? If its not a production license and if you are using production features such as operator workplace, faceplates, alarmlist then you will see Design mode on left corner. It is equivalent to license violation pop up but less annoying.
I got this before when I use 800xA system 6.0 at first. You have to change "Design Phase" to "Production Phase" in software factory. Also, you can find into "Reference Central Licensing System. Document No : 2PAA111691-610