I upgraded my iPad 2 to 5.01 and jailbroke. Now cydia is not showing any paclages from Bigboss repo. It is in my source list but when I go to it it is blank. http://apt.thebigboss.org/repofiles/cydia is what it says but nothing is in there.
Had the same problem...
In Cydia... on the main screen at the bottom, hit Manage, then tap Sources.... edit... delete BigBoss. Then go back to the main Cydia screen, tap "more package sources"... and at the top, you should see it listed as a default and be able to tap that to add it back, and it should fetch the contents of BigBoss for you.