Hi, there is a small bug in the /Info dictionary when using mkiv. The 'ModDate' is written as 'Context - YYYY.MM.DD HH:mm', which results in a blank entry in the 'Document Properties' of the viewer. Anyhow, to avoid preflight problems it would be wise to set /ModDate to the same value and form (p160, PDF Reference 1.7) as /CreationDate (like in mkii). Otherwise you must have trust in the comparison routines of the preflight software (which is no good choice). Just think about PDF/X-4, where all XMP entries (http://www.adobe.com/products/xmp/) are compared with the corresponding /Info entries. Best wishes, Peter