Capture of cell selction displays white screen

Hi. One of my co-workers is attempting to do a capture from within an Excel add in. All she is attempting to do is select a cell range but the review of the capture has a screenshot before the selection, a blank screen and a screenshot after the selection. In other words, the actual cell selection is not displayed even though the slide does appear to have captured something as there is the movie camera icon inside it. Can anyone shed any light on this? Using Captivate 3