I'm very much not an MT expert, but if I had to guess I'd say that somewhere in a configuration file you deleted something (such as a quote, or a here-doc ending in 'HTML'), and that's why it's complaining.
Usually when you get these string terminator type errors, it means that a variable isn't closed correct.
Then again, I don't know much about what mt-check.cgi does, but it's worth looking at...
- Jeff @ DreamHost
- DH Discussion Forum Admin