random "power PC applications no longer supported" on Mac, cant even open client.

after closing client and coming back to it a short time later without changing any setting or even touching my computer (dinner was ready) i came back to open client again to notice an alert on the screen saying that "Power PC applications were no longer supported". after using hextech repair kit, in the hope it might fix it, nothing happened. i havent reinstalled the client, but will if nothing happens on this thread. I just want a solution and to see if it any one else has this problem.

PS. i am on a mac, and am currently using the alpha client in OCE. cheers for any help in advance.