I just tried it again with one of my test users that I tried before. I am not able to duplicate the security token error. But what it is doing, when I try to upload more than one photo at a time (that are over my set limits) it will not let me but it does not come back giving me a message telling me why. It goes through the process of uploading the files and just jumps back to the upload screen prompt with any message or anything.
If I upload just a single photo then is come back and tells me the reason why.
I don't know why it will not come back giving a reason why when uploading multiple photos but it will when uploading a single photo.
I will keep looking into this as well.