I apologize if this question has been previously answered, but I didn't see it, so here goes. I put the fill over my terrain, hit 'ok' & everything seemed to be fine, but when I went to the 3d window I got an error message (I included it as an attachment) & my 'paint' didn't show up. I'm running AC8.1 in OSX Panther with the ArchiTerra 2.1 (downloaded and serialized) version. Any tips?
you can find the solution of this issue in the ArchiTerra user manual.
Probably you moved you project from a computer to another one or, for some reason, you deleted the needed macro used to display the colored area or you deleted and re-calculated the terrain (so the previous painted area, linked to the original terrain shape don't work anymore).
Simply select the terrain (only the terrain) and then click on the Paint Area tool icon, ArchiTerra will re-generate the macro once again.