I see that some threads have thread preview popups but most don't. Would this be due to the fact that threads have been imported and therefore don't contain any preview information? And would rebuilding 'Rebuild Thread Information' fix this?
Rebuilding the thread info should fix it. I don't think you need to rebuild the position/post counters for the preview, but you do need to do it for the "mini-me" avatar in old threads you've posted in.
