With the recent release of patch 5.0.4, two profession-related issues have cropped up. Unfortunately, neither of these can be hotfixed and will require a full client-side patch. Both of them will be addressed in some manner once the expansion has been released. Details of the two issues can be found below:
There is a bug preventing players from applying weapon chains to ranged weapons. When Mists of Pandaria does arrive, players will be able to attach the newest weapon chain to ranged weapons. All previous weapon chains will then be updated in a future patch.
Alchemists may have noticed that they are currently unable to select a specialization. This is because the specialization quest now requires materials from Mists of Pandaria. While this change was intended to eventually happen, our intentions were not to leave alchemists without the ability to select a specialization prior to the expansion’s release. You should be able to correctly select your specialization as of September 25. We apologize for the inconvenience these may have caused. It’s only a matter of weeks now until Mists of Pandaria arrives, so we ask for your patience in the meantime. Thank you for your understanding. We can’t wait to finally clear the mist for all of you!