I now have this on a fresh install of 1.11 on PHP7.1 and getting errors from the cron job.
PHP Fatal error: APCuIterator::__construct(): APC must be enabled to use APCuIterator in /var/www/support.crm.direct/public_html/include/class.search.php on line 966
It seems that PHP7.x does not support ACPu and fakes it out with acpu.so. I fixed my problem by editing /etc/php/7.1/cli/conf.d/20-acpu.ini and commented out loading acpu.so so osTicket falls back to its built-in caching.