Can't delete any Notifications about child's activity

Hi, I can no longer use the NF parental dashboard "Notifications" window to clear (delete) any of the alerts there, like "signed in during curfew hours" etc.

I can select individual alerts in the list, or click Select All. But clicking Remove Selected gets me an endless spinning circle cursor. I can refresh the page, which de-selects the alerts.

Windows 10 x64 - Internet Explorer, Chrome -- no luck.

Chromebook - Chrome - no luck.

If it helps, I recently deleted a device (Android phone) and added a different one. Could someone check it out? Thank you very much!