Sorry to do this on the main board...

I keep getting this message when I click 'submit' on my work:

Your submission could not be processed because a security token was missing.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.
At the time in question, I was Pming a mod about votes in the 'Beta pitch' (I literally just clicked on 'submit'), but I've also had it pop up when I've been posting on the main board too (about four-five times now when I click on submit).No doubt I've pressed something I shouldn't have...
Technology and me -- not good bed partners.

Thanks for any help.