@smapple, Please run the following command to fix the corrupted table in the database:
echo 'repair table nagios_logentries use_frm;' | mysql -t -u root -pnagiosxi nagios
mysqlcheck -r -f -uroot -pnagiosxi --all-databases
Also, please set the timezone in the /etc/php.ini to avoid these warnings:
It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function
Finally, please remove all files from this folder:
/usr/local/nagios/etc/import/