If a cursor’s message has at least one of the collision_* variables, then the parameter’s value is sent as part of the message, but only while the cursor is actually colliding with a curve. While no collision is occurring, that variable’s value is omitted from the message.

This means that the collision_* variable(s) would preferably be at the end of the list of variables in the message. Otherwise the position of the non-collision variables will shift depending on whether a collision is occurring, causing, for example the variable in position #5 to be in position #4 when a collision is not occurring, causing miss-assignment in the receiving application.

– Chris