I have a post with images on my blog, link. The post was done on my MacBook and loads fine (both in the Post Editor section and when looking at the blog). However on my PCs, using Safari/Firefox/IE/Chrome/Opera - none of them display the pictures in the top post (iPhoto to Jalbum). The Macbook loads them fine on either Flock or Safari.
I get the same thing when making other posts on the PC - I can't generate Thumbnails, I have to generate images at another size after uploading and then reduce them manually to Thumbnail size (hence why that post was written on a Mac).
All three computers have the latest Java available.
I get the same problem even on a vanilla WordPress install with no changes made to image directories, no plugins, default theme, etcetera. In the example link above the Uploads folder hasn't been changed at all.
Most strange of all, even if I go to the link of the thumbnail image on a PC, nothing displays (e.g. here. But if I do the same on the Macbook, it works fine.
My Uploads directory and subfolders have 777 permission.
Edit: I have shared hosting, could it be that WordPress wants the server directory rather than a 'public_html' subdirectory?