[Mediawiki-l] Image page - 1.5 vs. 1.6

[a@kid]

In v1.5.x, if the high resolution version of an image was very large,  
the image page would show a smaller version with a link to download  
the high res version. Since upgrading to 1.6.6 it looks like the the  
image page now shows the high res version regardless of its size.  
(1000px wide +)

Is this due to a setting that i didn't transfer over when i upgraded  
to 1.6
or a deliberate change in the software ?

thanks