I enjoy walled blocks and cities. I have not experienced this problem both pre- and post-patch.
Now, I will admit that I will take advantave of hills and rivers to act as walls whenever I can, but I have had several cities where I had nothing but walls.
Maybe the open spaces around those cities meant that the road was still technically "open".
Besieger,
Are you building your gates right to the very edge of the map? Maybe one of the gatehouse tiles indeed blocking an entry point. The entry point may not actually be the road tile at the edge of the map, but one next to it.
Because I want my immigrants to bee-line to my housing, I usually erase the first replace-able road tile at the entry point. I do this should I ever find it makes sense to replace it. Like for routing trade caravans in a particular direction.
This also means that if I build a gatehouse at the entry point, it is at least 2 tiles off of the edge.
Luck
[This message has been edited by MarcusMaximus (edited 09-15-2003 @ 09:23 AM).]