I'm still getting "LaTeX path not specified" errors on my blog, which uses lots of LaTeX. I have received notes from readers and can reproduce the behavior myself. Every time I reload, a random subset of LaTeX escapes come back as yellow blocks reading "LaTeX path not specified".
My guess is that WordPress is load-balancing the LaTeX plugin functionality among a bunch of different servers, some of which are not configured properly.
I posted a screen shot sent from a user in a post:
The blog I need help with is lingpipe-blog.com.