Selenium clicks on a wrong link (or does not click on a link at all) on certain machines

Question

I am using Selenium WebDriver 2.5.0 (tried 2.13.0, it did not help). I am trying to click on a link like this:

driver.FindElement(By.PartialLinkText("Customer - Creation").Click();

Before it worked, but I have tried to run the scripts after 3 weeks and I observe 3 different behaviors on 3 machines:

1. Machine A: There is no click on the link at all, also there is no error.

2. Machine B: It clicks a different link! Sometimes one above, sometimes one below.

3. Machine C (Virtual): It works.

I have not fully tested this (spent half a day today), but did anyone stumble upon such a behaviour?

I have restarted my PC, re-added the Selenium libraries. "SendKeys(Enter)" helps, but this issue happened not only to links, but to at least radio boxes as well, where "SendKeys(Enter)" does not work.

Please share your thoughts.

Update: Browsers are the same on at least 2 machines, Internet Explorer 8.0

Answer 1

One other thing to check for is the screen resolution (not the desktop resolution but the system level size of text and icons). I have two laptops in my office that are you used for testing, one running Windows 7 and the other running Windows 10. On both, the screen resolution was greater than 100% and Selenium was having problems moving the mouse to the correct location for mouse events like click and hover. As soon as the screen resolution was set to 100%, all mouse actions worked correctly.

Windows 7: http://windows.microsoft.com/en-us/windows7/make-the-text-on-your-screen-larger-or-smaller?v=t

Windows 10: https://superuser.com/questions/951199/windows-10-system-font-size-change