Hi David, I've just fixed this one - it's caused by trying to edit an application configuration when the selected surface is using the default settings, with no app config loaded. You can work around it by using the Surface menu's Load option to choose an application configuration that you want to apply to the selected surface. If you don't have an application configuration that meets your needs, create a new one using File, New, Application Configuration. A non-crashing version with a helpful error dialog will appear in Beta 4.4, but I won't upload this until you've had more time to find other faults and I've cured a few more of those that I already know about. Best wishes. Tim Burgess Raised Bar Ltd Phone: +44 (0)1827 719822 Don't forget to vote for improved access to music and music technology at http://www.raisedbar.net/petition.htm From: visurfacereader-bounce@xxxxxxxxxxxxx [mailto:visurfacereader-bounce@xxxxxxxxxxxxx] On Behalf Of David Reynolds Sent: 28 June 2012 21:13 To: visurfacereader@xxxxxxxxxxxxx Subject: [visurfacereader] Unhandled exception Hello, I was trying to edit an application configuration. I loaded the default, then went into the edit menu, and chose Application configuration. The program crashed, although it did actually catch the unhandled exception. Is this a piece of code which hasn't been done yet, or an error? Best, David.