After updating to 24.7.1 I see no logs anywhere in GUI:
System: Log Files - empty
System: Firmware: Log File - empty
System: Gateways: Log File - empty
System: Routes: Log File - empty
Firewall: Log Files: General - empty
Firewall: Log Files: Plain View - empty
Firewall: Log Files: Overview - in all tabs I see "No Data Available"
Firewall: Log Files: Live View - nothing shows here, regardless of filters/options set.
Checked under Firefox, Chrome, Iron and Palemoon flavors.