Ok, so every time I try to upload any media I get a message sort of like this:

Error uploading media 300(-200)

Does this happen to anyone else? And if so, how the hell do these mass uploaders exist? Or are they the ones who cause this message to appear? I have a lot of video's I'd like to upload, but I rarely get the chance...

Thanks ya

p.s. I accidentally deleted my previous blog about this issue, so this is the replacement one.