We are working on a complete re-write of the plugin that will address the ajax errors and take care of many of the issues mentioned in your comments.
We were nearly complete with the re-write when client requests and other responsibilities took a toll on our schedules. We are planning to dedicate a little time each week to getting the remaining issues resolved and to post a new version for you in about 30 days.
I am sorry for the delay, and for the period of silence. Thank you for your patience!