It maybe it's related to some other security software on your server, or even in your browser.
Is it possible to deactivate mod_security on your web-server to ensure that the problem isn't in it ?
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It's fixed! I talked to my web host, and they white listed some mod_security rules that had been triggered.They said I could have it deactivated, but the whitelisting seemed to do the trick on it's own.
Thanks for all the help again! :D