Updating Craft removed a channel from the CMS? Anyone experienced this problem?

I have a dev site set up which we updated to 2.4.2702. After updating one of my section channels has disappeared from the CMS.

The entries for the channel are still showing and I can see the channel set up in craft_sections on the database so any ideas what has happened to it and why it is no longer in the CMS?
This was resolved with the above comments from @mmikkel


  Craft Personal is limited to a single channel. Your license.key file must've been overwritten/deleted somehow when you updated – which is weird unless this was a manual update? In any case, if you have purchased a license and don't have a copy of the license.key file you'll need to contact support@buildwithcraft.com to restore it. If this is a dev build and you haven't purchased a license, just click the upgrade link in the CP footer and then the "Test" button under Craft Pro in the modal that appears.