HotFix 4 is for command line version of Switch Port Mapper - SWSPMCMD.exe. The best way to make sure the hotfix is applied is to apply it again Otherwise you can open the properties of the file, and check for Copyright text (tab "Version" in Win 2003/XP, or "Details" in Win 2008/7). The hotfix has the copyright dated to 2010 and the text starts with "@@@". The original file is dated to 2009.
Thanks for the really quick reply. That's exactly what I was looking for and confirms I don't have so I will get the Hotfix and get it applied.
Thanks and best regards,