tools wg pages broken?

I'm seeing the tools wg pages fail in a random fashion. For instance, if 
I access

I get the usual framing structure correctly, but the document frame 
contains just this:

"An error occurred at this point in the web-page generation. An error 
report has been sent to the webmaster. If this error isn't fixed within 
48 hours, please contact the web page author directly. "

However, curiously, this does not always happen. *Sometimes* I get the 
real thing.

Jari