I've had this issue as well. I haven't tried changing my mouse, but I have everything else, and to no avail. I did however find a way around the problem by creating all new pages with blank templates and then deleting all of the template pages. The only challenge with this is that once you insert a text box or image, etc, you still have the same issue where you can't edit it after. But so long as you have a plan going in it can work. Still a pain in the ass, and its a HUGE disappointment having these issues after paying for a year subscription, but at least it allowed me to get my website running for Christmas season.