When a Activity have a long text, the preview image does not show in the Activity Stream. When you open the Activity single-page both the image and all the text shows, so the problem seems to be in the preview.
When I'm looking at the text in the Activity (in wp-admin) I can see the tags [bpfb_images] in the end of the post and my guess is that they are left out in the preview. When I move [bpfb_images] to the top the preview image shows in the Activity Stream, so there seems to be some kind of limit of characters in the stream? Now I have to do this manually every time a user post an activity with a long text. Not a good solution.
Thank you in advance!