Graphics not appearing in published resource?

 Hi,

I'm wondering if anyone else has experienced a similar problem to the below...I'm not sure if it's a bug or just me. I made some changes to a course and republished, and suddenly found some of the graphics were missing from the initial and final screens. The preview works fine, but in both cases there are images on top of thought bubbles. The thought bubbles don't appear in the published course any more. I tried saving the project as a second file, which worked the first time, but not after further changes or subsequent re-saves. Have included a couple of screenshots of the first slide. Please let me know if anyone's experienced something similar or has any suggestions!

Thanks

T

File preview:

Published output:

Slide in Storyline:

(The image and cloud callout are grouped together...I can't reorder as the picture will then be obscured...the picture's appearing fine, and both are down as visible. Plus it's previewing fine. Am stumped...)