Toad hangs and cannot load objects in code roadmap

hi ,
using toad 16 , enterprise version for amazon , when trying to load or add any object for code roadmap, the toad hangs and just stays like , has to killed everytime. seems like it gets stuck as it is connected to database using apps schema (test environment) , we have oracle EBS database. how can i make it work ? is there a way to simply load from system file storage , pl sql package stored locally ?