No problem, jf1982.
A while back I went through the whole plugin and sanitized it of any code which was over-taxing on mysql. For instance on the ad places page, if you have too many on one page, it will crash. I've uploaded my sanitized version here:
deadcaterpillar.com/simple-ads-manager.zip
Simply overwrite all the files in your plugin's directory with the files in the zip.
hope that helps you out!