After some time of Xcode usage, I noticed that Run button goes grey. But after Xcode restart it is enabled again. Changing scheme to another doesn't help, only restart. In previous Xcode version I have no problem with that. Is this a bug? Do You have same experience?

Is it possible? If not, is there are any reason for that? Do I need create zone programmatically, only once, and after that when I'll deploy schema on production zone will also be created? Or maybe my application should check and create zone if it doesn't exist?