Can't edit physics in RW_Tools

[ilovenxstage]

When I try to go into the asset editor in RW_Tools and select a locomotive to edit the physics on, it keeps giving me "Run time error 5, Invalid Procedure or Argument", then locks up RW_Tools. I know I'm selecting everything right from the asset menu because I've done it many times before. Anybody have any ideas?

[Scott_AUS]

Are you running as Admin? From memory, RTE 5 says maybe not?