This release has no new features compared to v1.2.0.0.
It only fixes one bug in v1.1.0.0-v1.2.0.0 that only seems to occurs on Windows 7. These older versions generate an ImageUniqueId/System.Image.ImageId metadata value that is invalid according the XMP spec. It should be the hexadecimal representation of a 128-bit number, which amounts to 32 characters in the range 0-9 or A-F.
The old format is
FlickrId=<FlickrId>. The new version uses
FF4649<padding><FlickrId>. This string will be exactly 32 characters long, which is achieved by padding with 0 characters. An example of a generated ImageUniqueId in the new format is
FF464900000000000000003595605328. In the old format this was
FlickrId=3595605328. The prefix
FF4649 is just a way to distinguish these ImageUniqueIds from others, for example those generated by cameras.
If the metadata of a local picture needs updating and already contains a FlickrId in the old form, it will be converted and the ImageUniqueId will be updated.
This issue is tracked in work item
Application crash due to invalid ImageUniqueId on Win7.