I have exactly the same problem. I've just upgraded from 2010 to 2014 and I'm having trouble getting Find and modify to work. I'm using symbols I originally created in 2010, and they are all described as Light in the device type drop down, yet they can't be seen by F&M unless I select them, change them to Other and then back to Light again. Since they are initially imported as symbols and then converted to instruments in the document, what am I doing wrong?