Do you happen to have an older day's listing message that you can test to see if you can still read?
The idea being to determine if it suddenly happens like this on all of their messages, even ones that worked previously (your problem), or if it's just this particular one (probably their problem).
Have you tried NVDA+n, t, r, to run the COM Reg Fixing Tool? It can sometimes resolve the "web documents acting strangely" issue.
Although I doubt it will help here, it is still worth doing.