To reproduce:
1. Open attached project;
2. Open "animator_bug" scene;
3. Select "OpenableActivable" Game Object;
4. Open Animator window;
5. Select Parameters;
6. Enter Play mode;
7. Toggle "show" parameter;
8. Toggle "open" (with "show" == true).

Expected result: Square with text should fade in/out when parameter "show" is True/False, Text should switch in the square when parameter "open" is changed.
Actual result: Parameter "show" is ignored, parameter "open" fades out the object. Also, all the animations works only once.

Note: Animation Transitions are working correctly.

Reproduced on versions: 5.6.0a3, 5.6.1f1, 2017.1.0b4.
Not reproduced on versions: 5.5.3p3, 5.6.0a2.
Regression introduced on version: 5.6.0a3.