UCP Spinning Gear - Unable to Login

There is clearly a bug as 1 our our PBX’s is having this issue. It is fully patched
PBX Version: 15.0.16.72
PBX Distro: 12.7.8-2008-1.sng7
Asterisk Version: 16.11.1

error: jsphp_e82f8d8fcdab203358e9348121a2a668.js?load_version=v15.0.6.17:1 Uncaught ReferenceError: UCPMC is not defined
at jsphp_e82f8d8fcdab203358e9348121a2a668.js?load_version=v15.0.6.17:1

Unfortunately, since this is a clients hosted PBX we do not know when the issue started and with 50+ extensions, VM and DID’s rebuilding is not really practical.

Should we be opening a bug ticket?