For some reason with version .95 the trade routes don't work correctly. I am able to load resources onto a cart but unable to unload resources under any circumstance. The cart travels to the destination, pauses, and then leaves without unloading any resources.
Just to be sure these are the steps I took
Step 1 : next building
Step 2 : load
Step 3: salmon (10)
Step 4: finish waypoint
Step 5: next building
Step 6: unload
Step 7: salmon (10)
Step 8: finish waypoint
Step 9: send out