some files not opening properly on hosting server awardspace

I've uploaded files for my website from m开发者_如何学Pythony home test server to my hosting account on awardspace. It is weird that some pictures work when directlinking but others don't and I don't get why

It are jpg files, and it's in a particular folder /images and even weirder is that with some jpg files in that folder direct linking works, but with other jpgs it doesn't. I get an 403 error, while the file is there. I can see it with filezilla....

So what is wrong? on the home test server direct linking works.

EDIT: I'm guessing it has something to do with their forbidden words list. Although it's odd as pictures do not contain text?! I certainly hope they don't enforce the list on a paid hosting account as I already ordered one...

I have been using Awardspace very recently, and used core-ftp lite ftp program to easily change permissions to read, write and execute. It all works fine with me.