I have gone through all other posts on thunar thumbnailing issue but this one doesn't seem to match any of those; nor on the web anyone seems to have this problem, so I couldn't find solution on google either. Also, I have the following packages installed - thunar (version 1.2.3), tumbler. I am using Ubuntu 12.04 [updated].
This is what I expect (pic from nautilus) -
This is what I am getting (pic from thunar itself) -
Thunar is much better than nautilus in all expects, but for small ones like this one. Kindly help.