I still use 'sclj', an unmaintained Python command-line LJ client, to post my entries. As of a few weeks ago - I don't know when exactly - entries more than a few lines long are being cut off for some reason. I don't think anything changed on my local machine; and I don't see any errors.
I can reproduce the problem, but I'm not really sure what to do about it. Besides, of course, gripe about it here.