Cubase hangs when adding "Revoice Pro Link" VST3

worked ok before, but on this particular project Cubase started hanging when adding “Revoice Pro Link” VST3 to any audio track

I did 2 tests so far.

  1. deleted all tracks, tried inserting “Revoice Pro Link” on newly created track and in control room inserts. Cubase hangs also.
  2. imported all tracks to new project. tried inserting “Revoice Pro Link”. cubase hangs also.