CU 189, entries for DNS forwarding are printed with invisible ink on web GUI. Active entry, when not edited, it is not visible because it is printed with white color ink on almost white background. This must be a bug. I do not know if this is new in CU 189 or was already introduced several weeks ago. This was not a problem a year ago.
To replicate the issue, just create one entry for a zone to be resolved with different DNS server. For example, zone “home.” is served by my local DNS This entry will be added to “active entries” list and it is almost invisble.