I am an owner of the latest version of Ted Terrain editor.
Don't quote me on this, but I believe that Ted is compatible only with Dark Basic Pro. I have checked the website where Ted is sold and there is no mention of Dark Basic Classic anywhere, only Dark Basic Pro. I checked the forums also and there is no mention of DBC only DBP.
Gigabyte Board/2.93Ghtz Intel Core Duo Proc./4GB Ram/Nvidia Geforce 9400 GT(PNY)1GB Video/500GB Western Dig. HD/Dark Basic Pro 7.4
No one cares how much you know until they know how much you care.