It means what it says.
In testing, I found the best 'drive' settings for the LiteOn drives when overburning Verbatim 8x (MKM-003-00) DVD+R DL discs are FHT: On, OHT: Off, Overspeed: Off and SmartBurn: On.
So you can either stick with your current settings or have the program change the setting on the drive and turn OHT off.