instead of using click image try to use simulate click or send windows message because yes on the long run click image causes errors. Play around with the selectors.
@poppadom if you can’t find selector for the element ,try with anchor base or find relative element.Regarding input method,for unattended,simulate click or chromium API would be best.
Please check the below documentation regarding the input methods in uipath.
Apart from Hardware events all other input methods allows background execution. But the Application compatibility also need to consider.