Just to be sure, I downloaded the Mesh Project Viewer again after I saw your reply. Yes, I'm using the correct viewer.
Second Life 2.6.0 (218701) Jan 10 2011 13:44:19 (Project Viewer - Mesh)
Thanks for thinking of it!
I assume it's logging me into Aditi, but I don't see how I can confirm that by looking the client.
I tried uploading again, while using a screen capture app at a high frame rate. For just 1/30th of a second, the viewer shows text. Let me see if I can show a pic of that here: