It has been seen in Chrome (version 79.0.3945.117) and IE 11 (11.1184.17134.0):
CTRL-Left click properly opens objects in a new window, but CTRL-Enter sometimes does not.
As this has not been reproduced, this appears to be browser-specific.
Currently, restarting the browser has resolved this issue. If it is seen consistently, please open a case and provide the logs from the Automic Web Interface.