I can read LJ, create new top-level posts, navigate round the site with no problem ... but when I try to comment to a post, or reply to a comment, the "post comment" button is missing from the page.
I've reported it to support:
http://www.livejournal.com/support/see_request.bml?id=595144
But I then discovered that someone else has the same issue and reported it back in March:
http://www.livejournal.com/support/see_request.bml?id=563484
This only applies when I'm using the handset, and not when I'm using a regular browser from a desktop PC.
The symptoms are the same
Can anyone else who browses from a handheld device let me know if they have the same problem, and which OS/version/browser your handheld uses?