To reproduce:
1. Open attached Unity project "Source.zip"
2. Open "World" scene
3. Go into Play Mode
4. Click Server & Play
5. Create a character
6. Select the character
7. Observe console

Result: Multiple 'graphic rebuild while we are already inside a graphic rebuild loop' errors appear in the console
Note: In the UIPlayerTrading.cs script comment out Line 34 (myGoldInput.text = "0";). There will no longer be errors when entering a game with a selected character

Regression first introduced in: 2017.2.0a2
Reproduced on: 2017.2.0a2, 2017.2.0f3, 2017.3.0b5
Not reproduced on: 5.6.3p4, 2017.1.2p1, 2017.2.0a1

Note: