When you use the web gui to exclude domains or IP's the web graphs and plots are behaving strange.
API_QUERY_LOG_SHOW is set to "nothing" ?? And is not reverted back to "all" if you remove the excludes again.
Because of the "nothing" mode you don't see things of course in the query logs. Manually setting it back to "all" will give you back the query logs. However especially the plots and graph remain acting "funny".
Removing the excludes and set the setting back to "all" fixes the strange behaviour.