Yes like the others said its to prevent double posting, there's nothing wrong with just editing your last post.
Suggestion to stop this problem read through the thread before you post, not after you do.
ZeroOBK wrote...
Is it happening in topics where you aren't the last poster?
Yes do tell that could be a serious problem though I have yet to run across anything like that.
ZeroOBK wrote...
Though I've noticed that it doesn't seem to work all the time lately.
Yeah I've been seeing a lot of them lately too, seems to have something to do with the overloaded server.