[SmartCrawl Pro] Smart Crawl appears to cause trouble with menu changes

When I attempt to save menu changes in WP it resulted in a 504 timeout error. I finally started disabling/re-enabling the various plugins in use. The problem cleared when I disabled Smart Crawl. I then enabled rest of the plugins and tested again, no problem. I reactivated Smart Crawl and got the timeout error again. It's now deactivated and menu changes work just fine.