In the meantime, there's a solution to your problem -- just type ?style=mine into the URL of the comments page in your browser's address bar (for instance, this page would be http://rj-anderson.livejournal.com/617336.html?style=mine (http://rj-anderson.livejournal.com/617336.html?style=mine). Or you can even tell LiveJournal to view ALL comment pages on all journals in your own preferred journal style: instructions are here (http://www.livejournal.com/support/faqbrowse.bml?faqid=175).

I'm sorry that should be necessary, though! And I will try to get to the bottom of whatever's causing the problem.