Created attachment 127510 [details] Control Panel/All elements/Security & Maintenance/Details It stopped working. But normaly re-run in a few seconds.
I can see this was a crash. What were you doing when it occurred? Does it occur regularly, or it happened only once? LibreOffice 5.2 has a crash report feature, which pops up after most (but not all) crashes, did it offer to submit a crashreport?