Hi Everyone-
After investigating the issue, we've confirmed that H910 Dual will not appear in Pro Tools 12.3. There was a change in 12.3 with how some plug-in IDs were handled, and H910 Dual was affected by this. We're making a fix now, and will post the fix shortly.
As for UltraReverb, make sure you are using the latest version, which can be found here: https://www.eventideaudio.com/products/plugins/reverb/ultrareverb. This version should load without issue.
