I am facing a problem with mongo DB connection.
I have succefully imported tMongo components it to my Talend Open Studio 5.1.1 and by copying the mongo 1.3.jar file
The reason for the Job running without any error could be due to the connection / meta-data you have used for the Mongo Connector. It doesn't is not possible for the job to run without any error even after giving fakepath.
I guess you might configured (re-modified) the repository connection but using a built-in meta data for component.