Same issue here on the BlackBerry Tour. I'm in the U.S. and on Verizon. The mobile site was working about a week ago. I get the same blank page, but with the vehicle description in the title page of the browser.
Interstingly, OperMini v4.2.14912 works just fine. For me at least it appears to be a problem with the built-in BlackBerry browser.
This may be purely coincidence, be related to the 27 hard resets and all the cache clearing I did, or be just an outliers of user experience...
but it seems to me like that first page is loading consistently faster than it used to. Any chance you could look at validating the rest of the mobile site to see if performance can be improved on those sides as well? Not that they've been slow, just curious if there are more improvements to be found.