I have following problem. I run test on Firefox and Chrome. On Firefox test run correctly but on Chrome SauceLabs give a message:
unknown error: Element is not
I realize this is a super old question, but it came up while searching a nearly identical problem in the present day. After attempting many of the fixes described here and getting new exceptions for my trouble (mostly stale element and http request timeouts) I stumbled across this issue on Selenium's GitHub.
As described in the post, Chrome had advanced beyond the abilities of my version of chromedriver.exe--my v2.30 driver had known issues with clicking elements due to changes in Chrome v61 scrolling mechanics. Updating to the latest chromedriver.exe solved all my problems.
tl/dr: ensure your version of chromedriver is compatible with the version of Chrome being tested.