On the last day to enter images in the Panobook.org call for submissions, I located 3 tiffs (also had the option for jpgs), and prepared to upload them.  I uploaded the first one and got to a window that asked for textual information about it.  So, I complied.  The text appeared in its window, but the associated image did not.  So, given no further directions and only an Add An Image button, I uploaded the first image again, but the left image window was still empty. It said: Tiffs may not appear as thumbnails.  Ok, so I filled out the second text and uploaded its image.  Then, with no verification regarding what had been uploaded at that point, I filled out the third text window and uploaded ....  or tried to.  It said: you cannot upload any more, as you have exceeded the three maximum limit.  Ok, now it appears that I uploaded one twice.  It's bad enough that it said I could upload tiffs, but then it could not show a thumbnail in the proper window.  Ok, ok. I understand that might have been difficult, but to not let me know even the file names of what had been uploaded was not good.  Or, might I have wished that the uploader could have stopped a upload that had been uploaded previously, by matching up its name?  Seems more time had been given to the legal documents for my submission than to the uploader. :-(