Step by step can you explain to me exactly what you do to make this happen as its working ok for me so I must be missing a step somewhere.
BUG Reporting (Android App)

Ok.
- I start a game live, 10 min, no bonus.
- play, I tried it now, with one move, but i happenned to me with a 39 moves.
- I rotate my phone 90 deg.
- The app resize itself correctly
- but reset the board to its initial position. with the sound heard in the beginning of a game.

My last game, I did it to check more precisely my steps was with : rakeshkumar222
http://www.chess.com/livechess/game?id=356696175
Note that my second move, was done with a resetted board, after that I couldn't move anypieces.

Ok, great, I didn't check if it got an update this morning.
unfortunataly, It happen again.
This time, I didn't try to do any move. I was black, so after white played, I rotated my phone 90 deg and the board was reset, but I couldn't do any move then. The game was stopped by the server and I didn't lose points.

Yes, I have this rotation problem too. I took one tactic, made one move and turn my Galaxy 90 deg and system stopped (error info). Some thing if I click "tournament" button and choose f.ex. my current tournament. Then I turn my phone. Next thing what will happen is that I am back in the previous screen.
1- Game or tactics are reset on screen rotation change.
Status: New (from my point of view)
android Chess.com app Version: 2.73
Repro: 100%
Android version: 2.2.1
Phone: Motorola Defy or Motoblur.
when I rotate my phone, the app adjust itself (that is ok), but all the peaces get back to their initial positions. In tactics, the current tactic reset to its first move.