We have a problem in WebView when we try to show custom tab view data or MQ tab data.
It happens only for users that doesn't have Superadmin privileges where the tab is empty, meaning that if the user is Superadmin then the data is shown well.
Basically this is happening when we use custom xmltv files but also with the tabs in WebsphereMQ extension.
NOTE: We don´t see this problem when using the Workstation.
This is a bug in Webview 10.5.1.87 release.
Please open a Support ticket and ask for the hotfix APM10.5.1HF67_cumulative.zip which addresses this issue.