[Plugin: WP Document Revisions] New Document hanging up on crunching

When adding a new 16M document (where the new document interface says I have upload limit of 64M) the process stalls after upload is essentially complete and says “Crunching” – file appears to be placed in upload directory correctly but any attempts to look at the file through the plug in come back with file size = 0

http://wordpress.org/extend/plugins/wp-document-revisions/