Steps to reproduce:
1. Open user's attached project and load "bug" scene
2. Set layout to "2 by 3"
3. Set Game view's aspect ratio to 5:4 or 3.2 or 16:10
4. Move "Main Camera" in the Scene view or just move mouse cursor between Scene and Game views

Expected result: No errors are thrown when moving the mouse cursor or the "Main Camera" in the Scene view
Actual result: Error "Dimensions of color surface does not match dimensions of depth surface" is thrown when moving the "Main Camera" in the Scene view

Reproduced with: 5.5.0f3, 5.6.3p2, 2017.1.1p2, 2017.2.0b11, 2017.3.0a7