Is that Poser 4? If so, what loads initially is preferredState.pz3 in Runtimeprefs. I'm not sure what problem would cause that effect though I've had it happen on occasion. You can try deleting the invisible figure and see if you can load another one successfully. If it works, goto Edit->General Preferences and select "Launch to Preferred State" then press "Set Preferred State." Exit and reopen Poser and it should return to whatever scene you set. You can also try just renaming the preferredstate.pz3 to something like preferredstate.pz3.bad. Poser may complain when you start it but you should get a blank scene that you can customize and save as your new preferred state.

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