I tested this by creating a topic then deleting it. I got an error then after going back (browser back button) found the same thing, topic listed in forum but nothing in the topic and no way to delete it. I did this once more with another topic as I did not copy the error message and once again got the same results. Here is the error message.The requested topic does not exist.
Is this a bug in phpBB3 or is this specific to me?General Error
SQL ERROR [ mysql4 ]
Can't open file: 'neodaq3_search_wordmatch.MYI'. (errno: 144) 
SELECT w.word_id, w.word_text, m.title_match FROM neodaq3_search_wordmatch m, neodaq3_search_wordlist w WHERE m.post_id = '391850' AND w.word_id = m.word_id