VoiceThread seems had some problems a few days ago, so that's why all the student uploaded VoiceThread were gone. It seems they restored it. Marietta's recording is still available and probably others are now restore. However, for the one that Marietta posted it would need to be set it to public to be viewed by others and work for the recording.
Here is the information on VoiceThread support forum in which a lot of students had work lost for a couple of days and then it was restoried. It seems it was an unusual situation as many teachers reported using it frequently over time in their teaching See: http://voicethread.com/support/forum/comments.php?DiscussionID=894&page=1#Item_11
This is draft, so if you see corrections needed or artwork or text missing let me know at kk-b@psu.edu
Here is the information on VoiceThread support forum in which a lot of students had work lost for a couple of days and then it was restoried. It seems it was an unusual situation as many teachers reported using it frequently over time in their teaching See: http://voicethread.com/support/forum/comments.php?DiscussionID=894&page=1#Item_11