Problem:
Once you get the rails into a configuration as seen in the attached
You cannot change the orientation through a signal anymore.

"What I expected to happen was...":
The button press can still change the orientation

"What actually happend was...":
The signal is simply ignored

"Steps to reproduce":
1.) Arrange the rails in an S like in
Under each bent there is a button.
2.) add the missing rails like in
3.) press a buttons to see one of the rails moving like in and
4.) press the buttons to form the figure seen in

Once this configuration is reached you can press the buttons as much as you want, the rails won't change.

This bug appears also in 1.3.2. I did not test 1.3.1. I didn't check if the single player mode is affected as well (but I would assume it is).

The problem with this bug is, that it requires some structure to be build bigger than needed, since you need to place an extra rail between the two bent ones. Also, if you accidentally get into the configuration of step5.jpg, you are stuck and need to rebuild.