Oh, sorry for this really late reply to this but there are some things you need to watch and set correctly.
The PATHNODE as defined in the tile(s) .mdl file needs to also be correct.
There are several tutorials listed on the site in my signature that may help with that. Some of the pathnodes look a bit confusing, they may work, but then again, they may appear to cause a toon to get stuck.
For a specific tile that has walkable sections on your upper and lower parts of a tile, but that are not truly connected, IE only the roof and street level are walkable, with a high wall/building face in between, you would need a pathnode that specifically handles that or your toons can get easily stuck.
Sorry,.I am not at home on my normal computer so I don't have access to the many different screen shots I would use to explain the different pathnodes available. Here is a link to the
"Pathnodes" thread that is available in my tutorials section from the original CTP site now hosted on Harvest Moon. There are many tuturials in that same forum and a few others located in various other forums there as well.