Hey everyone!

I'm pretty new to SketchUp, been using it for about two months now to work on the 3D modeling of the home I want to build. So far, I've ran into the same issue twice. When done the basement, I made it into a group, and then hid it in order to model the main floor a little less confusingly. Now that I have finished the main floor, and try to unhide the basement group, it's not there. The first time it happened I just chalked it up to my error, and redrew the whole thing. Now it's happened for the second, and I'm pretty sure it's not my fault. The auto save file is no help, as the basement can't be found there either. I've tried everything I can find on the subject, including plugins. Any help would be appreciated, I don't want to redraw and then lose it all again. Thanks!