Unable to clear old events and triggers

[chromaker]

Hello together,

I have a problem with old events and triggers. I cant ack them via the web frontend. I get the error:
access denied
You are logged in as "admin". You have no permissions to access this page.

This happens only to old events. With old events I mean all before I upgraded:
- from zabbix 3.0 to 3.2 (because of PHP7) - here was all fine
- from ubuntu 14.04 to 16.04
- mysql from 5.6 to 5.7

I had a lot of issues with mysql 5.7, I cleared all errors and warning. Everything is running fine.

But I dont know where I have to look for that old events.
I tried clear directly in the database with:

https://github.com/mattiasgeniar/zabbix-orphaned-data-cleanup/graphs/contributors

https://github.com/burner1024/zabbix-sql

without result. New events are working and I can ack them.

Do you have an idea?

Thanks and with best regards,