Agreed. It's almost pointless to build any farms, since nothing grows unless you're practically standing there watching it.
I am experiencing this issue too. It was working prior to v1.2.0.11. Now I cannot turn my minecarts.
UPDATE
This has been confirmed resolved in v1.2.0.15
I am experiencing this issue too. Rails will only place in one direction. Unable to get any turns.
Inception is still not working on v1.2.0.11 (1.2 build 4).