by Zamte » Sat Jul 10, 2010 1:57 am
All gates require a 2x3 block settled over them. While a palisade or brick wall specifically requires this to be pavement, roundpole fences do not, however they do require the entire block be of the same ground type. You could have built the gate if none of the tiles were paved as well, or if you'd planted grass over them. It's a bit strange, but it's how it is.
As for "build a palisade"; Not all of us want palisades. I usually use roundpole fences early on just to keep animals out, and may continue to do so depending on if I plan to build a brick wall, as removing the palisade is a major hassle. Palisades are definitely more secure, but it's not always the best idea to just throw one down immediately.