First, that thread is (now) in the forum for Tragic Lantern, which is a more experimental and possibly more unsafe fork of Magic Lantern. The Magic Lantern nightly builds for the 50D are pretty stable and full-featured (including RAW recording), so I encourage you to stick with them rather than immediately going to more experimental builds.
Second, the first post in that thread hasn't been updated to reflect the progress since June 2013, so you're effectively using an outdated version of Tragic Lantern, which seems like an especially bad idea. If you wish to continue using Tragic Lantern, you can find the most recent Tragic Lantern builds linked near the end of that thread.