When you say disappeared from the board do you mean won your queen, promoted a queen and forced a resignation?
speechless
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I believe somehow you actually resigned the game so you lost the rating points
No,the queen literally vanished from the board,i didnt loose it,legally!atrocious!!
if u pressure the mouse and move pieces around (there is no submitt move click as in online)-such as moving a q. off the board and then back to original square,piece will leave game or end up on an unintended square.
It vanished because the pawn ate it 
Eddy,perhaps i did that,everything was happening so fast.but i doubt.no scott,no way..
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i was playing against gelfand1111 about a minute ago a blitz game we both had about 30sec left on the clock..i was a full queen ahead..then she just dissapeared from the board!i lost 8rating point!!!!!!!whats going on..i dont know if itts gelfand or chess.com..either way..i beg them back.thanks.am angry.