I've recently noticed that when I use the 'Analyze' board in Chess960, if I reverse a move and then try to make a new one, the computer won't accept the new move. It works just fine as long as I don't reverse, or undo, a move. When I do, I end up having to close the 'Analyze' window and open a new one. It's just a minor inconvenience. BTW, I use Firefox as my browser.

Is anyone else experiencing this?

I can't replicate that with firefox.  One thing to make sure of- are you positive you're not mistaking the conditional moves board for the a-board?

If that's not the case, was there castling involved or was it any move?

Thanks for responding. I'm sure it's not the 'Conditional Moves' board. And there's no castling involved, either. It happens for any type of move I make, then undo (using the < button below the board), and then attempt a different move. It just won't allow the new (different) move.

Try clearing your browser cache and cookies.  If that doesn't work... someone smart will come along and help you soon!

I figured it might have something to do with those,  so I'll try, then let you know what happened. Thanks!

No luck :-(

And you may have properly assumed it without me saying so, but I'll say it just for the sake of being thorough; I don't have the problem with the Analyze board in regular online chess.