JCBuilding

I am very much enjoying the program and spent many hours playing on it yesterday. When I opened the program this morning and tried opening the plan I created yesterday I am getting only a blank page. This is the same for all templates as well. I like to think that I am savy when it comes to design software but this one has me stumped. I am sure that it is something simple that I haven't found yet but any help would be greatly appreciated.