I have been experiencing this problem for last week or so. Without photos some of the posts looked really dull. Changing PC or ISP did not help. I suspected some issue with blogger. While going thorugh the blogger help group, I came up with this idea of changing your browser. If you are using IE then change to Firefox or vice-verse. I changed to Firefox and the solution really worked. You may read more on this from fellow blogger Peter's post Blogger: What to do when you can't publish, upload photos, etc..