http://img831.imageshack.us/i/pmumistake.png/
Above is the link to the to the screenshot I took or the 5th floor in sour root cave.
The circle area shows where it is not blocked but should be (the vine that I am stading under).
The square area shows a normal piece of land that is bloked when it should not be.
(sorry about the cropping its my first screenshot)
Well, its not a big problem but just letting you know.
Xcalibur