Yes i think there is a problem with novaexchange because nova not scanning his Timereum deposit addresses but instead scan always Eth Timereum contract address. But after new TME token is realeased there will not be any more problem with any legit exchanges. We have just to wait until dev finish new TME token.
So, why TME not available on coinExchange or Yobit? Or any other exchange? Because problem with TME.
Because dev and community not have enough money to pay listing fee on this exchanges. As i read the community raise funds and pay on novaexchange 0.1 btc and voted with freevote 250 and was the only exchange. Now after dev sells 200 new genesis addresses will have enough money to pay more exchanges listing fee.
This and dev also will fix TME contract code so it will become fully EC20 compatible!