Xbench 2.9 was developed back in 2011 so it only supports well until Windows 7, which was the operating system at the time. In later Windows releases it may have quirks or issues here and there, so Xbench 2.9 is not really supported on Windows 8 or later because it pre-dates them.
The workarounds to avoid issues are to go back to Windows 7 or to switch to Xbench 3.0, which is actively developed and supports Windows 10.
Unlike Xbench 2.9, Xbench 3.0 is a paid subscription but has a trial for 30 days of actual use (not 30 calendar days) so that it can be thoroughly evaluated at the user's pace. Xbench 3.0 can be downloaded from here.