V7.5.1 - Reminder setttings does not work

I have installed a fresh version of SuiteCRM 7.5.1 on ubuntu 14.04 machine. When I create a call or a meeting & set reminder, that setting is not applied to that record. With logs investigation I have noticed that following values are set as -1,
reminder_time, -1,
email_reminder_time, -1,

This is working perfectly fine on V7.2.0

Any suggestion what is wrong.

Regards,
Rajendra