You should know...that if you're having issues with doing_wp_cron appending to all of your URLs and you don't have BackUpBuddy installed, this plugin may be causing the issue.
I didn't read through all the posts here so if someone else already reported the problem, sorry for the duplicate. But quite frankly I just wasted enough time trying to figure out what what was causing the problem since all of my URLs were going crazy. I turned off all the security and backup plugins...blah blah blah and nothing changed. I finally turned this off and voila...cron crap gone.
Plugin deactivated = No more crons gone wild.