Try looking in your MBM_settings.d2j file and set UseMLPathing=false
This may or may not help... kind of a shot in the dark. If you turn it to false, make sure to readjust your chicken settings to true.
Pros:
Less path finding errors.
Doesnt lag after entering Durance lvl 2.
If using a sorc, you tele in a straight line to lvl 3.
Cons:
Pathing is not as "smart."
If using a sorc, it is likely you will eventually teleport into the middle of a bunch of undead stygon dolls with might, causing death in most cases. (Make sure you have chicken turned on.)
Anyway, prolly more info then you needed. Give it a try and see how it works.