Also getting the Internal server error from my Blackberry...
Additional info says "internal compiler error application/vnd.wap.wmic"
The site is served with the correct content type "text/vnd.wap.wml" so either that 'wmic' is a typo or it is indeed a Blackberry problem.
Looks like a Blackberry issue, yes?
Oops. Forgot to mention I'm using MS Pocket IE emulation mode, and WML and HTML Content Mode.
Hope it might help.
'fraid not, as my knowledge (along with the aforementioned testing capability) is really limited. The only thing I can try is restrict the number of stories and see if the smaller WML file does load for those that currently have trouble.