I'm posting this mostly for the Chess.com staff since the tactics trainer is hung on the problem that starts from the position below:

The problem freezes at the 'Waiting for the computer to move' stage. The problem number is not revealed because of it. I'm posting this here so that the staff might be able to use the position to find the problem?????

Thanks,

G

Thanks :)

I am having the same problem. Can you tell me how the problem was fixed in your case?  Thanks,

John,

Send a message to the site and let them know. I never got the problem number, but they somehow reset the trainer and it's working for me now.