XnView Software

here is the file (actuall a crop from a bigger image produced by Rawtherapee v2.4B3... crop was done in Photoshop to make it easier to share the file w/ the developer for analysis)

http://rapidshare.com/files/176194988/iso_bug.tif.html

XnView v1.95.4 detects ISO as 0, while for example Adobe Photoshop CS4 detects ISO as 100 and PhotoMe detects ISO as 100.

for the record PhotoMe reports:

Field = ISO speed rating
Content = 100/21
Tag-ID = 8827
Tag Name = ISOSpeedRatings
Data Format = SHORT

Please try XnView 1.96 beta