PLN to DWG problems

[navidsidiqi]

Hi folks,

I am desperately in need of finding a solution for my problem....

I had an origional PLN (ArchiCAD) file  which I converted to DWG. I have been working for a long while but suddenly everything that I did in the new file is gone for some reasons. The new layers that I worked on are still there but I cant see anything in them.

Anyone can tell me what the problem could be if I have all the layers but no drawing on the screen. I should also add that they are not frozen/switched off

Any suggestions would be appreciated

Thanks

[ntellery]

Is there a red light bulb bottom right of screen?  Have you isolated objects?  I've done that before, saved and opened the drawing later to find everything missing.