Check to make sure that details (props) are enabled in the auto visleafs section and that all your visleafs are enabled.
If that doesnt work in hammer navigate to your HammerAutosaves directory (by default its C:\HammerAutosave) change the open filetype to VMF_AUTOSAVE. When it is, save as yourmapname.vmf
If you mean you have no models at all I suggest you make sure your opening the right mod, checking to make sure your gameinfo.txt exists and that tf2 is updated.