I have drawn an object with multiple faces and holes and all was well and then all the faces have disappeared. I can only click on the lines. This happened once already and I thought I just deleted them by accident. Drew the object a second time and once complete with faces intact after dropping back out of edit group, whamo, gone again!
Check your View settings - Face Style is NOT set to Wireframe.
Choose say Textured…
Any improvement - if not it could be a flaky Graphics Card ??
If you draw a new rectangle does it get a face ?
It would be helpful if you would share the .skp file so we can see what you are working with.