Perhaps this is just because you are fixing something, but right now when I go to AppHQ to preview my app, the screen shot images are not loading.
 
When I drag one of the broken images into a new tab, I see this:
 

<Error>

<Code>AccessDenied</Code>
<Message>Access Denied</Message>
<RequestId>4DB37994FD8DA31C</RequestId>


<HostId>
zXRQf0RVYpEGmNRV0IEkr9wAOcLOIp5+K/lw/268PmPjWwF/Ba3j0940rL6Iqj+C
</HostId>



</Error>

 
Looks like something is messed up in your S3 bucket.