A few days after releasing 2.41 I found out that if you start the Switch Port Mapper with an empty history database (as a new user would), you would see this error message "SQLITE_ERROR: duplicate column name: voiceVlan". This was due to a problem in the creation of the new Voice VLAN column introduced in 2.41. It worked fine if you already had data in the history database.
Version 2.42 corrects this - new trial users take note! We also took the opportunity to update SQLite to version 220.127.116.11 and update the MAC address to manufacturer database.
Please upgrade to v2.42 by clicking Help/Check for Update or by visiting http://www.SwitchPortMapper.com/