I'm having problems creating certain types of items in the administration module of Omeka 2.1.4. I enter various metadata in the "Dublin Core" tab; set the item type to "Still Image"; and select the file in the "Files" tab. After I click the "Add Item" button, a new item is created that has no metadata, file, or collection. It shows up in the items list as "[Untitled]". This happens with TIFF, JPEG2000, MPEG-4, and PNG files that I've tried, but does not happen with JPEG or PDF files. File size does not appear to be a factor, as a 4MB JPEG will be accepted, whereas a 4MB TIFF file will be rejected.
Does anyone have any ideas as to what could be causing this?