No graphs on any item

[AndWei]

Zabbix does not draw any graphs, neither backgroung nor graphs as such. The browser shows a 'missing image' symbol instead. Tested with multiple browsers on Windows (Firefox 78.7.0esr, Edge Version 88.0.705.50, IE11). What could be wrong?

CentOS Linux release 7.9.2009 (Core)
zabbix-release-4.0-2.el7.noarch
zabbix-web-4.0.28-1.el7.noarch
zabbix-cli-2.0.1-1.el7.noarch
zabbix-get-4.0.28-1.el7.x86_64
zabbix-agent-4.0.28-1.el7.x86_64
zabbix-web-mysql-4.0.28-1.el7.noarch
zabbix-server-mysql-4.0.28-1.el7.x86_64

[Atsushi]

That's a bug. It will be fixed in the next version.

https://support.zabbix.com/browse/ZBX-18919

https://support.zabbix.com/browse/ZBX-18931