Single Status Update
I am ready to help. The problem to me seems an IDL_PATH issue. Would you please verify the following path in the idl.pref file (in default installation, it locates C:\Program Files\Harris\ENVI54\IDL86\resource\pref folder)?
IDL_PATH: + C:\Programmi\CAT_ENVI;<IDL_DEFAULT>
If there is no such statement in this file, would you please add it? Let's me know if you do see this path.