I am quite frustrated with the same problem and although I’ve done some digging and looking around for a solution, I haven’t really found one. I am using WP 1.5 and Firefox 1.0.2. When I first installed WP, everything worked fine. Now, no matter what I do, I get a blank page. This is true also of IE 6.x. At first, I could get into MT Admin with no problem. Then, when I got a blank page, I tried just using the Press It bookmarklet, which allowed me to get in in a “back door” kind of way. Today, however, the Press It bookmarklet window is also blank. I can’t post or edit anything. If someone has a solution, please post it here.