Thanks for the link. Wish I had that 3 months ago when I worked on past project. I should mention that I did not have much luck with Zorro with a very complex high poly model imported from Revit.

@jennk42 said: I am using Sketch-up 7.1 and have been building a model of the first floor of a hotel. I worked all day today and just noticed that a bunch of parts of it are missing! And it isn't something I could have accidently deleted because it is multiple parts in different locations on my model. For example all my light fixtures, flooring in another part etc. Some of it is stuff I did today others yesterday. Does anyone have any idea what could have happened? I checked and made sure all my layers are on and I made sure to un-hide everything. Like I said I would have had to go in and manually select all these things and deleted them. And everything was fine when I started working this morning. I am desperate because this is my final project for school and I am on a deadline. Thanks! jennk42 1)If you have auto save and backup set you my be able to find a "correct" file. Do a search for xxxx.skb. There are several ways to open this type of file. One is change name to xxxxx_A.skp and it will open 2) Layers does not isolate geo so if you have items on a hidden layer then it can be deleted if you are not careful with your selection 3) Make max use of components and the outliner to see what things you are selecting, hidden items will not appear here either