I have the same problem, says that i should update my signature, but i already did some time before.
All of you (and anyone else that is having issues with the claim button) should submit a ticket on yobit's website about it. This thread really isn't the place to get support for payment issues. It has also been mentioned that the claim button won't work when the payout wallet is low.
Another suggestion would be to try the button at different times of the day. You can also use the trollbox on Yobit to get an admin's attention.
this is the signature campaign on bitcointalk and we are posting here to get paid and this is the official thread of the signature campaign so they should solve the related problems here not through ticket!
who said this? the users guessed or the admin said it. give link to the comment.