We have this issue before in SimplePress 4.4.5 using WordPress 3.3.2 that long links are not working and not redirected to the correct url, So we decided to upgrade to latest version. It’s working for a new post reply but on old forum post before the upgrade links is not working anymore. Please see the screenshot below. It’s creating a new link with incorrect url. Let me know your thoughts about this. Thanks!
http://screencast.com/t/9IdoVwEQD