We're experiencing a server problem apparently. When posting, quoting or replying, simply hit "send" once! Ignore the error message that you get and do not try to determine the problem or fix it - all you will do is cause multiple, duplicate postings. Send and click out to another page. If you then go back and check your posting, you'll see that it went through fine.
If you get the page error message, DO NOT hit the back button and send again. Open a new browser check to see if it posted first. 9 out of 10 times it did go through.