When importing scene files containing mental ray nodes, you may see warning messages such as:
// Warning: 'Draft.message' is already connected to 'mentalrayItemsList.options'. //
These warning messages, about pre-existing connections between mental ray related node, are harmless and can be safely ignored.
A warning dialog box also appears when these warnings occur. If you are importing many files and wish to avoid manually closing the warning dialog box for every file, you may want to use the file command with -prompt false.
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