I had the same issue with AS400 DB2 but it only affected 1 package of about 12 that read from the same system. The package was working fine until a added a script task to lookup the error description. No matter what I didn't the package would throw random error massages or work. I tried wrapping a try catch around the script command - No luck. The exact same script command works perfect in another package that is run in the same job just prior.

I finally gave up and just deleted the script command. I can lookup the errors myself if I really care but most of the error related to inserts/updates are pretty obvious: Missing data or key violations.

If anyone finds a solution i would love to know!

-Mike