Storyline 360 - Changing the state of an image on a Resume Saved State screen that when published works in Flash, but does not work in HTML5.

I have developed a custom progress bar that is controlled by a numeric variable and triggers which add value to the variable, in turn, changing the state of the image within the bar to represent user progress through a lesson. It works flawlessly in Flash, but our client requires all lessons to be in the Modern Player running in HTML5. On Resume Saved State screens, the image that is programmed to change within the progress bar fails. Is this an HTML5 limitation on Resume Saved State screens, or is there a known method to combat this error? These are branching screens that require the Resume Saved State setting. Thank you in advance for your assistance.