Get WP site to show in Blackberry?

I noticed that when I try to visit my WP websites on my Blackberry Bold, all I see is a blank page. On the Blackberry Storm, it shows up but the header image is missing.

Is it difficult to get a WP site to show up on Blackberries or other mobile device?

Other html sites I did seem to show up in these newer mobile device with no problem (apart from those with Flash content).

Thanks for any help!