Closed captions disappear after each marker

Hi all,

I usually use the default playbar and have never had any issues with closed captioning. However, for my current project I'm using custom navigation buttons for the first time and have been trying to figure out how to get closed captioning to work the way it does with the default playbar.

I'm using a button with a conditional action that checks the value of cpcmndCC, and sets it to either 1 or 0 depending upon the value to show/hide closed captions. The problem I'm having is that the closed captions display when the button is clicked, but they immediately disappear when the subsequent audio marker is reached in the timeline. For example, the audio for one slide might be broken into 3 sections of closed captioning. When I hit the CC button, the first section shows up, but when the second section should display, the CC box disappears. I can hit the button again and see the second section, but then when the third section should appear, the box disappears again.

I've tried researching the issue but haven't come across this particular problem with a solution anywhere. Hopefully this is a simple fix! Can anyone suggest what I'm doing wrong?

Thanks!