Timing of text-to-speech is off when slide doesn't have seekbar
I am using text-to-speech with my videos in Articulate Storyline. After capturing the videos using Articulate Replay, I run the video in Replay and then add the text-to-speech elements to my slide based on the timing in Replay. However, when I preview the video with text-to-speech, the timing of the text-to-speech elements is off by a second or two. The slide doesn't have a seekbar but I noticed that when I add a seekbar, the timing is aligned with what I can see in Replay. The slides are lightbox slides so I would like to avoid using seekbars. Has anyone experienced a similar behavior and/or can anyone explain to me why it happens and how it can be solved (if it is possible to solve it without a seekbar)?
It is driving me crazy that I can't count on the timing in Replay so any input would be highly appreciated :-)