I have a wordpress site with some images that are used as background sections of my pages. Sometimes they load perfectly fine, other times they won't load.
I've tried everything on the wordpress side to fix this but now I think it's something to do with the hosting. I've noticed that when the images are working I can navigate to them directly; for example: http://offcolor.xtreemhost.com/wp-content/themes/adhesive/images/img01.jpg
But when the images are not working, trying to navigate to them directly gives me a 403 error.
I also tried hosting one of the images elsewhere and linked to it. After doing that, when the images stopped working, the one that I had hosted somewhere else continued to display properly, while the others did not.
What could be causing this strange behavoir?