Dear Mr.Rick,
Right now, I don't have OpenOffice/Libre Office installed on the Laptop which I am using right now. (I have never tried LibreOffice) On a later date, I shall install and check.
1. After a fresh reboot of you PC, please check the process list via your task manager and note whether the soffice.bin or soffice.exe is running in the background
I believe that it will not be there.
2. Open Calc from your PC's menu and then quit OpenOffice Calc.
3. Now please re-check whether soffice.bin/soffice.exe is there in the process list via task manager. I believe that it will be there.
If soffice.bin/soffice.exe is still there in the process list then, I may be wrong, but I think that soffice.exe or soffice.bin remains in the process list even if you close the OpenOffice Calc. I am not sure whether this is done purposefully to enable fast loading (QuickStart) of OpenOffice application OR an OpenOffice bug.
Regards
Anser