To reproduce:
1. Open user's project
2. In Hierarchy window, select Cube object
3. Drag the Cube object off screen using move tool, repeat multiple times if needed

Expected: cube is relocated to the opposite side of the screen making identical results every time
Actual: cube is relocated to the opposite side of the screen resulting in various trail outcomes (check TrailOut.gif)

Reproduced in: 5.5.0b3, 5.5.0f1, 5.5.4f1, 5.6.1p4, 2017.1.0b9, 2017.2.0a4
Not reproduced in: 5.4.5p3, 5.5.0b2
Regression starts in: 5.5.0b3

Note: until version 5.5.0b3, Unity used different solution for cursor going off screen while dragging object
Note: suggestion - Trail Renderer should not make any trails while being relocated to opposite screen side by cursor going off screen