DNG thumbnails rotated & mirrored in EM2 on XP

Hi

I have some fuji .raf files that I converted to .dng to try and save some pace. I used the adobe dng converter and did not embed the original. Compatibility was left at camera raw 5.4+ and the JPEG preview to medium.

When these are imported, the thumbnail for landscape format images are upside down and mirrored. The full size view is fine. If I change the thumbnail to be the right way up, the arrow buttons to the top right of the main view change the thumbnail in the opposite direction and once I finally have the thumbnail in the right way, the main image view is now wrong.

I have tried rebuilding, and changing to the default orientation. I have also tried re-exporting the .dng without a thumbnail and with camera raw 2.4+ compatibility but the results always end up the same.

The thumbnails look fine in bridge CS5 on a different PC (also win xp sp3)

Any ideas on how to fix?

Thank you for your help
Callum