After a lot of work on my model, it suddenly disappeared from the screen,Then I found it in a state where most of the faces were turned into lines and Im not able to select and see the materials and groups,also some faces appear by irrelevant colors .how can i fix it ? (im using 2017 sketchup pro)
This sounds like a case of some entity being at a huge distance from the model origin. Possibly a label that had one been attached to a group that has been deleted. Can you share the file so we can try to help you?
I don’t know what happened. I reset to perspective view and did zoom extents, maybe a couple times and I see the model performing normally.
I noticed four microscopic components by the origin, reacting strangely.
I don’t work in metric so I am unsure but is the building 38,720 meters tall?
And another note, I noticed the drawing was in parallel projection. For this I have to say:
Parallel projection! Good God you all! What is it good for? 
Only orthographic elevations, plan views, and some special presentation views–not modeling. OK sometimes you need to see things straight on…
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Egads, the room is 24 miles tall? That could certainly cause some display anomalies. I bet the “tiny” things by the origin are actually 1:1.
thanks for your notes, when this issue happened i became insane and scale my model so wacky.you are right and i appreciate for your time :)))
Sorry. I had to step out for awhile. Are you all set now?
I see the wireframe thing when I first open your file.
The main part of your model is at a huge distance from the origin. This isn’t good.
It’s best to model in Perspective and save Parallel Projection for scenes for display.
And purge your models once in awhile. There’s a ton of unused stuff in this one.
Purging all this stuff reduced the file size by nearly 44%.
ow wow i had fortune on my side because you and some others help me ,i really appreciate your attemp.you were sublime 
Mmmm do i need to use “purge unused…” to remove tons of unused stuff?
ow wow i had fortune on my side because you and some others help me ,i really appreciate your attemp.you were sublime
Mmmm do i need to use “purge unused…” to remove tons of unused stuff?
Thank you. No one has ever called me that before. 
That’s the easy way to sort out the unused stuff. Go to Window>Model Info>Statistics and click the button.
kisses for you:)))
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