[smurfyou]

I’m not sure the iClock is doing anything for you. I don’t think Pro Tools will lock to any video ref except Sync HD or Sync X.

Even without video sync there should be no drift. Only a slight sync offset for every play. But Decklink cards especially with older Blackmagic software were notorious for random sync drift. I’m not sure which versions are acceptable. Hopefully somebody else can chime in. I switched to Aja.

That still does not explain Pro Tools freezing upon loading video from Nexis. There can be some stuttering and dropped frames if it is a high bitrate video and your bandwidth is suffering. I don’t know what could cause the freezing though. Do you have another SSD so you can play video locally?