Yeah it's a bug. I think the workaround is to ignore the big orange Start Training button and instead choose View Courses. Pretty sure you can then just click on a lesson and you're OK. Try doing a Search Forums here; I know I've read about this problem before.
Problem with Chess Mentor
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Here you go. One of these 50 previous threads must hold the answer:
http://www.chess.com/forum/search?keyword=Chess+Mentor+access
Although I have not used the Chess Mentor for a day and a half, it says "You have reached the maximum daily Lessons for your membership level.
Diamond users have unlimited access to this feature!"
Can anyone tell me why is it so? Please help.