Are you looking at the correct storey in 2D?
Are all layers on?
Are renovation filters turned off?
Have you tried zoom to extents (fit to window)?
If you are in 25, you can select something in 3D, right click and say 'show selection in 2D'.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10