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Please ensure that you are running the latest version of the beta code. Run pihole -up to update to the latest, then verify that the problem still exists before reporting it.
Problem with Beta 5.0: The flush network button in the Settings tab of the web interface doesn't work.
What exactly do you see? From the settings > Systems page, "flush network table." Then confirm with "Yes, flush my network table". What is the next screen after that? Info window at top about 5 seconds appearance that says the network table has been flushed?
Ok, so I guess one of my extensions is interfering. It works in Incognito mode. It also appears that the graph is different, it's a wave in normal browsing, it's a bar chart in Incognito.