Thumbnails not showing on latest update

I just posted a new update in my grow journal thread (Bilbo's - Room To Grow) and none of my pictures showed up as thumbnails, just links. My other few posts all show thumbnails and I did everything the same way. Any suggestions RIU?
Thanks Bilbo.

If anyone is having the same problem I think I figured out what made the thumbnail not appear. To position my already uploaded pictures around in my post I was cutting and pasting. This last post instead of scrolling and highlighting the picture like I did for my previous posts, I just clicked on it to highlight it, which showed up in the post as a link, not a thumbnail.