Step 1: Create a thread in a forum and sticky it. Step 2: Sync Now in wordpress. Check posts: nothing Step 3: Un sticky the thread. Step 4: Sync Now. Check posts it appears. Now that's on my dev server, but on my live server sticky posts are refusing to appear even after I unsticky them!
Same threads (same database) on dev server wouldn't sync either. May be because they are old or large. But when I moved them to other forums they could be synced to wordpress but the comments were not synced.