What about DM credits?
What about them? They are worth whatever amount time XP they were before. Since the time XP is doubled, the DM credits are doubled by default. There's no additional change outside what the change to time XP already did. >.>
What about DM credits?
My belief would be when they are cashed in, i.e. if you cash in 1 credit it is now equal to the doubled time xp.
I'm not the only judge obviously, but that's my thoughts.