I had the same problem described above but I couldn’t fix it that way. Suddenly I recocknized that wordpress showed a blank page after submitting a comment but I did not make any major changes. I switched themes and updated from wp 1.53 to 2.03 but it still didn’t work. I solved the problem by naming my WordPress’ URI after the real URI and not the domain’s redirecter. To outline that, here’s a quote of the Bug Report that exactly solved my problem:
I found IT. When you have a redirect on your server like me (http://weblog.unitedstatesofpeter.com redirects the browser to http://unitedstatesofpeter.com/weblog ) and you have set in the options, the Blog address (URI) as the first mentioned URI then 2 things dont work: you cannot promote users, even if you do all the referrer stuff, and your comments go to a blank page. It is a bug I think because my users should be able to get linked all the time to weblog.uni…. . But OK. For me it works now!
