First of all, there's no need to panic. No coins are lost, this is probably just small glitch of mytrezor backend which don't see the transaction for some reason. There's "Support" button on myTrezor screen. Please send report there, including log of Javascript console (please press Ctrl+Shift+J in Chrome/Firefox, reload mytrezor page and send us the log) we'll check your issue and we'll fix it.
It's always better to send bug report directly to us instead of bitcointalk, because the email (and support ticket system in near future) is read by dedicated support team. Bitcointalk is read just by us in free time.