It’s great that you are releasing a new version, I hope that it corrects an incompatibility issue that I discovered with Contact Form 7. I was getting failures to send mail with the form, how long this was going on I have no idea, a client alerted me to the problem, at first I thought it was the form plug in it’s self, but, it wasn’t. I then started the usual deactivation of plugins to find the conflict, the moment I deactivated WP Super Cache, the issue cleared up, so, sorry to say, it was WP Super Cache.