Melodyne Extension displaying wrong clip

Trying to use Melodyne 5 as extension on certain clips. Problem is, when I hit to edit the clip in Melodyne, -sometimes- the wrong clip appears.

I’ve tried rendering a new version of the clip… and then applying the Melodyne Extension to the new clip, but to no avail.

a) is this a known issue?

b) is there a workaround?

Again, it works in some clips on the track, but not others.