I want to thank everyone for the additional info and files.
We've narrowed down the issue, which involves getting Winds of Steel from the Crucible Knights while having been already "committed" to help either the Dozens or Doemenels, and we'll include the fix for this soon (likely going into the next patch).
This issue was unrelated to what affected eRe4s3r's game (resolved already in the upcoming patch), but this thread alerted us to the additional problem.
Thank you again for your help and patience, folks.
Does this mean that accepting (but not completing!) The Bronze Beneath the Lake won't block us from continuing the Knights' quest chain?