I have a cron setup to run every six hours and have had no problems for 6 months. I just added a large number of pages and I received an out of memory error. I logged in and change some settings such as setting max memory to "0", but when I go to the Crawling tab the RUN button isn't there. The page has the "run in background" text and the checkbox, but nothing below it. There is also a 15mg crawl_dump.log file. Any suggestions on getting this to run again?