Nevermind! I had to cheat, which is really frustrating. Somewhere way further up, I noticed that it was recommended to manually set the character sheet to "OGL." But that option does not appear anywhere that I can find. However, when you view the help file for the Concentration settings, it lists "Sheet" as one of the settable properties (despite there being no button for it). Going through the chat log, I determined that using this command line (manually) !cmaster --config,concentration,key=sheet,value=OGL Ought to do the trick, and lo and behold! It does. That seems like a significant oversight to me, inasmuch as it was not easy to figure out through the UI. Just my $.02 anyway. Colin C. said: I've been using CM for months, and for the life of me, Concentration *never* prompts for a roll. These are my settings. As best I can tell, these have worked for everyone else in this forum. I've tried having the Concentration status as a condition instead of a spell. I've tried with the Concentration status requiring Concentration and not. I've tried setting the Attribute under the Concentration settings to "hp" and to nothing, as well as constitution_save_bonus. How is this supposed work?!