happens with this system in long REPLY's ever since it came out in October. That is one of the problems on the wish list to fix, hopefully in the near future.
Marcia Butler has also indicated a remedy. You will need to make more than one reply post to get a long reply posted. It also happens to me and what I do is start with the very last paragraph, if it is a long paragraph then start with the last few sentences. Copy and paste it to either:
Word Pad or
Note Pad or
New Rich Text Doc
then while it is highlighted on the reply page delete that portion, hit the send button and see if it will go. If not then copy and past the very last paragraph or few sentences again on that reply and copy past as above, again delete that portion, hit the send button and see if it will go. Continue doing that until you get the 'reply' small enough that it will send.
Now, you have the uncomplete 'reply' seperate that you can copy/paste in a "Continued" post. Course as sometimes happens to me.... even that one is two long and I go through the whole process as above and make the REPLY in three broken posts....just put "Continued" at the beginning of the title (subject).
Course when a long post will not send some people will do it the opposite way. Just put it all on Word Pad/Note Pad, etc and start from the top down trying to fit a group of paragraphs in and work on down fitting into more than one REPLY post.