Windchill 10.1 and Creo 2.0

Working on a migration plan from massive amounts of ProE data on many network drives to Windchill 10.1. Problem is when I locate a ProE object on the network drive and try to save it to my workspace I get an error "xxxxx.prt cannot be saved to the workspace"... but if I migrate to a different folder location open up a completely different object I am allowed to save that .prt to my workspace. Now if I go back to my original object xxxxx.prt I can save it to my workspace. This is repeatable.. my problem is for every object I want to save to my workspace I have to go through this ridiculous process.