why all my games a locked

My opponent cannot move pieces

Is this the only game your opponent has had difficulty making a move? He won't be able to make a move unless he moves out of check or captures your piece. 

The yellow squares just show where the last move was. 

yeap just this one, but before was faded yellow no is just squares?

Yep, just a visual change. I've checked and I was able to move a piece in the game. 

he is trying to move its king, doesn't allow it.

ok I will ask him again!

Thank you

My friend says he still cannot move. He sees my last move but cannot move the piece.

Is he using a mobile device?

Yes he is!

What type of device? I've been able to replicate the issue.  If he can download the android or iOS app he should be able to make a move. 

He is using HTC android device.

Does it mean he will not be able to move unless downloads the software?

All games are locked. same problem as noted above. Latest move bordered in yellow.using an ipa

For right now yes.  We're working on the issue as we speak, but right now you'll need to use the app to make a move. 

Edit: Or a computer. Regular browsers aren't having any issue either.

I'm having the same problem...I had to access my chess.com app to make my move

hmm I wonder whats happening

because it would let you move

The good thing is that the app is free.