if it works fine in older versions and not newer AND no one else can reproduce it, there's a very good chance it's because of something in your script that worked in older versions and not in newer. As of 6.3, various changes meant to prevent scripts filled with certain errors from working (such as missing closing parentheses) have been added. This can make a script that has errors stop working correctly until it's fixed.
That said, it *could* still be a bug of some sort. However, you haven't said yet if you tried producing this on a clean copy of mIRC 6.31 (no scripts at all installed). My guess is that you can't reproduce it without a script installed. If that's the case, then it's your script.
