Opening .dwf in 64bit version

Hi, I am a very novice user! I created some wiring diagrams in a 32 bit version of DS on another computer, and when I open them on a 64 bit version of DS at home, I get a blank drawing area on the screen. If I go "edit"  - "select all" I can see the detail (somewhat shaded) but can't do anything with the file. Operator error no doubt, but help would be appreciated.

Regards

Prolec