Since the Incursion story had been updated, I have noticed the borg modulation UI was missing for my Romulan character. The remodulation UI does disappear and reappear for my Federation and Klingon characters. It does not appear for my Romulan character at all after the borg had adapted to my weapon.
Comments
(Just to the right of the Pahvan Healing Crystal in the picture)
There was already a post covering this issue.
https://www.arcgames.com/en/forums/startrekonline#/discussion/1271870/special-abilities-tray-does-not-appear