OK I have the same scenario: I have characters that need to be lip-synced and of course scrubbing is the the best way to do that while keyframing. Two things I’d like to ask and offer to troubleshoot:
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Are all 3 machines Windows machines? Mine is WIndows 10, latest update.
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I can scrub the same .WAV file on the Davinci Resolve edit page or with Fairlight audio.
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Were you ever able to scrub with UE 5.0.3 ? That is the release I am on since it came out (a month ago?)
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Are YOU on 5.0.3 ?
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I tried other projects–same thing.
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A few days ago (same machine, same UE version) it WAS working. I was making a change in keyframe timing (had keys BETWEEN frames on an FK animation track). After I changed it. the audio stopped scrubbing. The audio track is attached to the FK skeleton animation track. I detached it and loaded it on another track. Same issue. I tried to re-import the audio. Same issue.
I had I checked my WIndows update log and there was a security update a few days ago. This has to be unrelated (because Davinci allows scrubbing audio) but I mention it anyway.