Macros in alerts sometimes don't expand since update to 1.8.1

[Veslar]

Hello,

I tried to search the forum but didn't find the solution for my problem. I upgraded both zabbix server and agents to 1.8.1 from 1.6.x few days ago. Since then, I am recieving emails like this one:
{TRIGGER.NAME}: {STATUS}

Instead of for example:
Processor load is too high on ABC Server: OK

I tried to search log files but with no success. About 10% of emails are ok, which makes it even more weird.

I would be grateful for any help. Please let me know if you need more information.

Thanks
Veslar