It is likely that the view camera has moved far from the model contents. If you share the skp file here, we may be able to fix it. If it is 16MB or smaller, you can drag the file into the reply window. If larger, copy it to a file sharing site and provide a link here.
I haven’t seen this problem in a while. Your model crashed SketchUp three times before I was able to fix it. There were a couple of bits of geometry at a huge distance from the rest of the model which caused the issue. Zoom Extents wouldn’t fix it because the camera was alsready zoomed out to show the extents of the model. Not I have this:
I notice you haven’t been making groups or components of the model you’ve created. You need to be doing that as you go along. I also see incorrect tag usage. Untagged should be left active (pencil icon to the right of Untagged) at all times. Only groups and components should be given tags.
I untagged all edges and faces within the model.
Lots of unused stuff to purge from the file. Mostly stuff you’ve downloaded from the 3D Warehouse but then deleted. Deleting objects from the model space doesn’t remove them from the file. Here’s the result of purging unused components and materials from the model. This reduced file size by about 70%.
I found the problem component. It was the gym object with the weights. I’ve deleted it and further purged the model. This got rid of those text entities, too.
I would advise you to open a separate SketchUp session for collecting stuff from the 3D Warehouse. Check it over carefully and make sure it’s what you want BEFORE you add it to your project file.
FWIW, I can remove the errant text entities without deleting the gym equipment, but the model still contains a lot of excessively detailed objects most likely from the 3D Warehouse. For example, the bicycle uses over 340000 edges! Surely it is not a main focus of the model?
one billion kilometers long !