Selenium Grid: Different Resolution with identical Nodes

[pierre....@datameer.com]

Hi Selenium folks,

i use Capybara with Selenium Grid since a good while and since a few weeks i run into the problem that on some Chome nodes in the Grid the Screenshots made by page.save_screenshot are different from the other nodes. All nodes have exactly the same setup (drivers, libs, os, webdriver, chrome).

We set a fixed resolution for our tests with current_window.resize_to(x, y) and in the past this worked fine for us.

On one proxy we have 2 pixel more in height than in the other and we don't know why. Any ideas or suggestions would be highly appreciated.

Screenshot of the issue:

Here are more technical details about the setup:

Capybara 2.18.0

Nodes:

- Ubuntu 16.04.04 LTS

- ChromeDriver 2.40.565383

- google-chrome-stable 67.0.3396.99-1

- Selenium Grid v.3.12.0

- 3 proxies with 4 chrome instances each, one proxy is broken

- Capabilities {browserName: chrome, maxInstances: 4, platform: LINUX, platformName: LINUX, seleniumProtocol: WebDriver, server:CONFIG_UUID: ...}