Chain keeps slipping off front gearring reposted
 

Sorry to have to repost but the original disappeared.

In the first post I was told to look for bent teeth and bend them back.
and to take a file to the inside of the gearring.

Here's that thread: http://www.bikeforums.net/showthread...ront-gear-ring

Front derailleur adjustment process:
http://www.parktool.com/blog/repair-...ur-adjustments

Wouldn't think that this is a recumbent-specific issue.