i sent them message and they gave me that response: "
Hi! We heard that this problem occurs a lot since about 2 days. It is some kind of problem with myetherwallet. Don't worry, your tokens are in your wallet for sure. You can add a new token with symbol "PLAY1" for example, and then you will se them again. The symbol is just the display name of the token within your wallet. We do not know until now why this is happening suddenly, but we will investigate. Sorry for the inconvinience! " AND I TRY IT, it worked well.
i think that ther are something which wrong somewhere because why some people can see very well them balance and other people can not see for them? they must always change the symbol before the display show them the balance.