| I have installed IDL 8.6 on MAC Sierra.   
 Recently, I updated Mac Sierra to High Sierra, and then IDL 8.6 meets some problems.
 
 For example, I tried to include a new idl source code path (e.g. /username/idl_source_path) to IDL  ( idlde -> preference -> path ), and compiled an idl program which calls  idl codes in the path. However, the idl can not find the source code and shows  "Attempt to call undefined procedure: xxxx' ".  Then, I rechecked the IDL preference, the path became uncompleted (e.g. /username/idl_ ).
 
 How to fix the problem?
 
 Thanks!
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