Dual ISO interpolation - really low resolution

[GiamBoscaro]

Hello,
I'm trying to use Dual ISO. I have canon 500D and everything is working good, but when I use cr2hdr.exe to interpolate the Dual ISO image, I get a DNG output with a really really low resolution (like 384xsomething). My original file is more than 4000x3000px.
What am I doing wrong?

[Walter Schulz]

cr2hdr version in use?
Command line arguments used?
Upload a sample Dual-ISO somewhere and link it here for debugging.
And processed DNG, of course.
Other postprocessing steps involved? Viewer used?

[GiamBoscaro]

latest version
no arguments, I just drop the image over the exe
I use the default windows viewer. Actually seems like that if I open it with lightroom, the image is in full resolution (but the non active area is included I don't know why). So maybe it's just a problem of the windows image viewer. Whwat do you think?

[Walter Schulz]

No proper input -> Unable to reproduce -> no thoughts.