I changed the channel number on a few of my fixtures and now they are no longer on the stage map. How do I get them back?
I have seen this issue before, but couldn't replicate it on a newer updated version. You can try to change the number once again and see if that populates the fixture back to the map. I have had a similar issue happen more often when I patch multiple dimmers to the same channel number resulting in more than one box with the same number. The process of renumbering them once more fixed the issue - resulting in one box for each patched channel.
That sounds like you encountered an issue we found in an older version of the console software, you should probably update your console.
At the time of writing the current release is 2.6.0, you can download it from the ETC website here:http://www.etcconnect.com/Products/Consoles/ColorSource/Software.aspx