Okular or any pdf reader

From: blubee blubeeme <gurenchan_at_gmail.com>
Date: Wed, 25 Oct 2017 17:30:31 +0800
Whenever I try to launch any audio pdf viewer program my computer hard
locks up and I have to power cycle.

Does anyone have any info as to why?
uname -v:
FreeBSD 12.0-CURRENT #0 r319752: Sat Jun 10 01:59:26 CST 2017     blubee.me:
/usr/obj/usr/src/sys/GENERIC
Received on Wed Oct 25 2017 - 07:30:33 UTC

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