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You are as thorough as always Optodata, thanks for this and for pointing out that the issue has been escalated to CL and that they are chewing on it since fall last year.
Indeed I have seen the (undesired) effect inside PD too.
The hint I would give to the development team is: look at the frame by frame mode in the title designer: There is some hesitation at the beginning when you play the title at once. But you see the same hesitation when you play a step to the next frame, and it is repeated for each of the next frame steps. Almost if there is too much to calculate for that step; sometimes the title even disappears before it gets to the next frame. This hesitation is not always there. E.g. it becomes visible and apparent when I “play” with blur and opacity, 2 color gradient etc. Almost too much to calculate. Well, calculation can happen, but that should not be visible in the produced video.
FYI, for the short term, I have circumvented this problem by, in each of many instances, taking snapshot of "good" frame and using that for entire passage. Pain-in-the-arse, but, is now done, and all is cool.
Something interesting I noticed while accomplishing this (5 short films): In regard to titles, I used only two fonts, one black, one white. Without exception, the "fluttering" occurred
only with white font, never with black. I can't imagine there's cause/effect going on, but, ??.