When upgrading to backgroundrb 0.2.x, make sure you delete the old ./script/backgroundrb directory. Also make sure that backgroundrb.yml is renamed/deleted. After installing, run "rake backgroundrb:setup" to generate the appropriate setup files.
If you get something like
"LoadError: no such file to load -- slave"
Make sure you have the gems, slave 1.1.0+ and daemon 1.0.2+ installed.
Then, according to the mailing list, if you get:
"ERROR: there is already one or more instance(s) of the program running"
Make sure you delete the old log/backgroundrb.pid . Thing should work after this.