It appears that the guide does not have HD in the program information for the shows on Cartoon HD. Setting up a series to record on this channel does nothing.
This seems to still be impacting only the last areas to get CN HD. Earlier areas had the problem for several days and the data was eventually added to the program guide. An STB autocorrection MAY correct the problem sooner since if the guide data is actually available but not yet present in you STB, then it will update.