I'm using to entrace effects on 2 different pages in Captivate 2019. When I publish the course there's a flash for a split second before the effect executes. I've tried changing the transition but it has not corrected the issue.
I've just finished a Cp project, in which I made extensive use of effects. Previously I too had problems with flashes before the effect executes. It depends what you mean by 'flash'. In my case it was that the visual object appeared for a split second before the effect ran. Now I set up for each effect object under Timing a transition Fade in only with a short duration (I go for 0.5 sec) and this really helps.
That was my suggestion as well, but it is not alway having the wanted result, especially for SVGs and shapes. Hence my second suggestion about Delaying. That is always functional.
The first one is an image. The effect works fine. It's when the slide first appears that it flashes for a split second and then the effect works as it's supposed to. The other one is a text caption.
Which Entrance effect please? Did you try my workaround? Mostly I have only that flickering for SVGs and Shapes, rarely for other object types. It depends also on the used browser. Which browser?